Which PS2 BIOS to Use? Best Version for PCSX2, AetherSX2 and All Emulators (2026 Guide)

Downloaded a PS2 BIOS file and still not sure which version to actually load into your emulator? You are not alone. Many players pick a random BIOS file, end up with crashes, black screens, or region errors, and never understand why.

The right PS2 BIOS is not just a formality. It directly determines which games boot successfully, how stable your performance is, whether save states work correctly, and how accurately the emulator recreates original PS2 hardware behavior. Pick the wrong version and even a perfectly working game ISO can produce a blank screen.

This guide covers everything: every regional version, every BIOS version number, per-emulator recommendations, per-game guidance, and a quick decision tool that tells you exactly which BIOS to use for your specific setup.

What Is the PS2 BIOS and Why Does the Version Matter?

The PS2 BIOS is the firmware Sony permanently embedded into every PlayStation 2 console ever manufactured. It initializes hardware components, manages region locking, handles memory card operations, and loads the game software. Every emulator needs this firmware to accurately recreate the PS2 environment.

What most guides skip is this: Sony released multiple different BIOS versions across the PS2’s production life from 2000 to 2013. Each version fixed bugs, improved stability, added DVD player features, and refined system behavior. The version you choose affects how many games run correctly, how they perform, and whether certain advanced emulator features work as expected.

Running a v1.60 BIOS from a 2001 launch console is not the same as running a v2.20 BIOS from a 2008 Slim model. The differences are real and measurable in a significant portion of the PS2 library.

Complete PS2 BIOS Version History

This is the most detailed version of the timeline available anywhere. Sony never publicly announced individual BIOS updates, but the homebrew and emulation community documented every version through console hardware analysis.

Sony ended PS2 production in January 2013 after 13 years. The BIOS version v2.20 found in late SCPH-90000 series Slim models represents the last firmware update Sony ever released for the platform.

Understanding PS2 BIOS Regions — The Most Important Factor

Before discussing which version number to use, the region is the first decision you must make correctly. Using the wrong region for your game library causes more problems than any version mismatch.

Sony manufactured the PS2 in four distinct regional formats. Each region has its own BIOS with its own video standard, language configuration, and region lockout rules.

NTSC-U — North America (USA, Canada, Mexico)

The most widely used PS2 BIOS worldwide. Covers the overwhelming majority of the popular PS2 library. If you are playing mainstream English-language titles and are unsure what to choose, this is always the correct starting point.

Console Models: SCPH-39001, SCPH-50001, SCPH-70012, SCPH-77001, SCPH-90001 Video Standard: NTSC at 60Hz Best BIOS Version: SCPH-70012 (v1.90) for general use, SCPH-90001 (v2.20) for maximum stability Games Best Served: GTA San Andreas, God of War I and II, Resident Evil 4, Final Fantasy X, Shadow of the Colossus, Metal Gear Solid 2 and 3, Devil May Cry series, Tekken 5, Kingdom Hearts series

NTSC-J — Japan

Required for Japanese-exclusive titles and import games designed for the Japanese market. Also necessary for early PS2 releases that launched in Japan before worldwide release.

Console Models: SCPH-10000, SCPH-15000, SCPH-30000, SCPH-50000, SCPH-70000 Video Standard: NTSC at 60Hz Best BIOS Version: SCPH-50000 (v1.70) or SCPH-70000 (v1.90) Games Best Served: Katamari Damacy (original), Ico (original Japanese version), Yakuza series, Dragon Quest VIII (Japanese), Namco × Capcom, Shin Megami Tensei titles

PAL — Europe, UK, Australia, Middle East

Designed for consoles sold across European markets. PAL runs at 50Hz instead of 60Hz, which is why PAL games can appear slower or have audio sync issues when run through an NTSC BIOS without proper patches.

Console Models: SCPH-50003, SCPH-50004, SCPH-75003, SCPH-75004, SCPH-90004 Video Standard: PAL at 50Hz Best BIOS Version: SCPH-75004 (v1.90) or SCPH-90004 (v2.20) Games Best Served: Pro Evolution Soccer series, Asterix and Obelix XXL, PAL-exclusive sports titles, European versions with regional content differences

NTSC-C — China

The rarest regional version. Designed specifically for PlayStation 2 consoles manufactured for the mainland Chinese market. Almost no one outside China needs this version.

Console Models: SCPH-70000 (China variant) Video Standard: NTSC-C Games Best Served: Chinese-market exclusive PS2 titles

Every BIOS Version Explained — What Each One Actually Does

BIOS v1.60 — SCPH-39001 (USA Launch Model)

This is the BIOS that shipped with the first North American PlayStation 2 consoles. It established the baseline for all subsequent versions and handles the early PS2 library reliably. v1.60 is lightweight, uses fewer system resources, and boots quickly on lower-specification hardware.

Strengths: Best compatibility with early PS2 launch titles from 2000 to 2002. Lowest resource usage. Works well on older PCs and budget Android devices.

Weaknesses: Missing DVD player improvements added in later versions. Some later PS2 titles from 2004 onward show minor graphical glitches. Does not include the save system fixes added in v2.00.

Best for: Playing PS2 launch titles, users on lower-specification hardware, anyone who needs the lightest possible BIOS.

Specific games that run best on v1.60: Tekken 4, SSX Tricky, Gran Turismo 3, Twisted Metal Black, TimeSplitters

BIOS v1.70 — SCPH-50001 (USA Mid-Generation)

Sony’s first significant firmware upgrade for the North American market. v1.70 addressed DVD compatibility issues that affected a portion of the library in v1.60 and improved overall system stability. It became the most widely recommended version for general use in the PCSX2 community for many years.

Strengths: Improved DVD player code. Better stability than v1.60 across a wider game range. Reliable with both early and mid-generation titles. Good balance between resource usage and compatibility.

Weaknesses: Predates the save system improvements in v2.00. Some late PS2 titles (2005 to 2008) still show compatibility gaps.

Best for: Balanced general use across the mid-generation PS2 library. Users who want broader compatibility than v1.60 without the hardware demands of newer versions.

Specific games that run best on v1.70: Burnout 3, Silent Hill 2 and 3, Jak II, Ratchet and Clank 2 and 3, and Sly Cooper

BIOS v1.90 — SCPH-70012 (USA Slim Launch)

This version launched alongside the PlayStation 2 Slim in 2004 and represents Sony’s most substantial BIOS update. It added improved DVD player support, better region handling, refined memory card behavior, and significant performance improvements across the board. v1.90 is the current standard recommendation from the PCSX2 development team for most users.

Strengths: Best overall compatibility across the entire PS2 library. Handles both early launch titles and late-generation games reliably. Improved DVD player code reduces compatibility gaps. Works well on all hardware tiers.

Weaknesses: Slightly higher resource usage than v1.60 and v1.70. A very small number of early launch titles prefer the original v1.60 firmware behavior.

Best for: General-purpose use across the full PS2 library. The single best version for users who want one BIOS that covers everything.

Specific games that run best on v1.90: God of War I and II, GTA San Andreas, Resident Evil 4, Shadow of the Colossus, Metal Gear Solid 3, Kingdom Hearts II, Final Fantasy XII

BIOS v2.00 — SCPH-77001 (USA Late Slim)

Sony’s penultimate BIOS update added significant save system fixes that resolved memory card write errors affecting a portion of the library in earlier versions. It also improved DVD region handling and refined system behavior for late-generation titles.

Strengths: Fixes save system bugs present in all earlier versions. Best compatibility with PS2 titles released between 2006 and 2009. Improved memory card write reliability.

Weaknesses: Higher resource usage. A small number of users report specific early titles behaving differently compared to v1.70 or v1.60.

Best for: Playing late-generation PS2 titles. Users who experience save-related issues on earlier BIOS versions. High-end PC and flagship Android users.

Specific games that run best on v2.00: God of War II, Persona 3 and 4, Dragon Ball Z Budokai Tenkaichi 3, Naruto Shippuden Ultimate Ninja 5, Guitar Hero series

BIOS v2.20 — SCPH-90001 (Final USA Slim Model)

The last BIOS version Sony ever released for the PlayStation 2. It represents the most refined and stable version of the PS2 firmware and offers the highest compatibility across the complete library. v2.20 is the version found in late SCPH-90000 series consoles manufactured from 2008 onward.

Strengths: Maximum stability. Best memory card compatibility. Most refined save system. Highest compatibility with late PS2 titles. Recommended for users who want the definitive firmware version regardless of hardware demands.

Weaknesses: Highest resource usage of any BIOS version. It may be slightly slower on very low-specification hardware. A tiny number of original launch titles have subtle behavior differences compared to v1.60.

Best for: High-end PC setups, flagship Android devices, users who want the most stable and complete emulation experience available.

Quick Decision Guide — Which BIOS Should You Download?

Best PS2 BIOS for PCSX2 (Windows and macOS)

PCSX2 is the definitive PS2 emulator for desktop computers. It has been in active development since 2002 and supports the complete PS2 library. Here is the exact BIOS recommendation for every PCSX2 use case.

Best overall BIOS for PCSX2: SCPH-70012 (NTSC-U, v1.90)

This is the version the PCSX2 development team itself recommends for most users. It covers the full library, handles both NTSC and PAL games reliably when combined with appropriate widescreen patches, and performs well across all hardware tiers from mid-range laptops to high-end gaming desktops.

Best BIOS for early PS2 titles on PCSX2: SCPH-39001 (NTSC-U, v1.60)

For launch titles from 2000 to 2002 specifically, v1.60 produces more accurate behavior because it matches the firmware environment those games were originally tested against.

Best BIOS for maximum stability on PCSX2: SCPH-90001 (NTSC-U, v2.20)

High-end PC users who want the most refined and stable emulation experience should use v2.20. It requires more processing power but delivers the best save system reliability and the most complete compatibility.

Fast Boot vs Full Boot — Which One to Use:

Fast Boot skips the PS2 startup animation and loads games instantly. Use it for 90 percent of your library. Full Boot shows the complete PS2 boot sequence, including the startup screen and PS2 browser. Some games require a full boot to function correctly, such as Final Fantasy X, Shadow of the Colossus, and certain titles that check memory card data during the BIOS boot screen. If a game shows a black screen on Fast Boot, switch to Full Boot in Settings > Emulation and try again.

How to switch BIOS in PCSX2: Open PCSX2, go to Settings, click BIOS, click Browse, navigate to your BIOS folder, and select the version you want. PCSX2 allows instant switching without reinstalling anything.

Best PS2 BIOS for AetherSX2 and NetherSX2 (Android)

AetherSX2 and its active continuation, NetherSX2, are the best PS2 emulators available for Android. Both use the same BIOS format and the same setup process.

Best overall BIOS for AetherSX2 and NetherSX2: SCPH-70012 (NTSC-U, v1.90)

This version delivers the best balance of compatibility and performance on Android hardware. It handles the mainstream PS2 library reliably and performs well on both mid-range and flagship Android devices.

Best BIOS for flagship Android devices: SCPH-90001 (NTSC-U, v2.20)

Devices running Snapdragon 8 Gen 2, Snapdragon 8 Gen 3, or equivalent flagship processors have enough processing power to handle v2.20 at full speed. This gives you maximum stability and the most complete game compatibility available on mobile.

Best BIOS for mid-range Android devices: SCPH-70012 (NTSC-U, v1.90)

Mid-range devices with Snapdragon 778G, Snapdragon 870, or equivalent chips perform best with v1.90. It provides excellent compatibility without the additional overhead of v2.20.

Best BIOS for older or budget Android devices: SCPH-39001 (NTSC-U, v1.60)

Devices with older chipsets benefit from the lower resource usage of v1.60. It may not cover the full library as completely, but it provides the most stable experience on hardware that struggles with newer BIOS versions.

Best PS2 BIOS for RetroArch (PC, Android, iOS)

RetroArch uses the LRPS2 core (based on PCSX2) on PC and the Play! core on mobile. Both require a valid PS2 BIOS file placed in the correct folder path.

Best BIOS for RetroArch on PC (LRPS2 core): SCPH-70012 (NTSC-U, v1.90)

The LRPS2 core performs most reliably with v1.90. Place the BIOS file in retroarch/system/pcsx2/bios/ using lowercase folder names. On macOS and Linux, the folder names must be lowercase exactly — PCSX2 and Bios in capital letters will not be detected.

Best BIOS for RetroArch on Android and iOS (Play! core): SCPH-70012 (NTSC-U, v1.90)

RetroArch is the primary PS2 emulation option for iOS users since AetherSX2 is Android-only. The Play! core on iOS accepts v1.90 reliably. Place the BIOS in the RetroArch system folder accessible through the Files app on iPhone and iPad.

Best PS2 BIOS for DamonPS2 (Android)

DamonPS2 accepts all standard .BIN BIOS files. It performs most consistently with SCPH-70012 (v1.90) for general use and SCPH-39001 (v1.60) on older or lower-specification Android devices. The Pro version of DamonPS2 unlocks widescreen support and additional save slots.

Best PS2 BIOS for EmuDeck and Steam Deck

EmuDeck is a popular emulation setup tool for the Steam Deck running SteamOS (Linux). It automatically configures PCSX2 as the PS2 emulator and creates the correct folder structure. You simply place your BIOS files in the designated location.

EmuDeck BIOS folder path: Emulation/bios/

Place your BIOS .BIN files directly into this folder. EmuDeck’s PCSX2 configuration picks them up automatically. For Steam Deck specifically, SCPH-70012 (v1.90) is the recommended version — it runs at full speed on the Steam Deck’s AMD APU on most PS2 titles at 2x internal resolution.

Per-Game BIOS Recommendations — 25 Most Popular PS2 Titles

This section exists nowhere else. Most guides give you one recommendation and move on. Different games genuinely perform better on different BIOS versions.

NTSC vs PAL — Understanding the Speed Difference

This is one of the most misunderstood topics in PS2 emulation. Here is the complete explanation.

NTSC games run at 60 frames per second by design. PAL games run at 50 frames per second. When you run a PAL game through an NTSC BIOS, the emulator attempts to run 50Hz content on a 60Hz system timing. This creates a persistent audio sync problem and can make the game feel slightly off in motion and sound.

The correct solution is always to use the PAL BIOS for PAL games and the NTSC BIOS for NTSC games. PCSX2 has a built-in workaround called EE Cycle Stretching that can compensate for frame rate mismatches in certain titles, but matching the BIOS to the game region is the proper fix that eliminates the issue entirely, rather than compensating for it.

How to Keep Multiple BIOS Versions and Switch Between Them

Serious PS2 emulation users keep multiple BIOS versions loaded simultaneously. PCSX2 supports this natively and makes switching seamless.

Place all your BIOS .BIN files in the same BIOS folder. PCSX2 detects and displays every valid file. In Settings > BIOS, you see a complete list with green checkmarks next to verified versions. Switching between them takes three clicks and does not require restarting the emulator.

Recommended multi-BIOS setup for most users:

Keep SCPH-39001 (v1.60 NTSC-U) for early launch titles, SCPH-70012 (v1.90 NTSC-U) as your primary everyday BIOS, SCPH-90001 (v2.20 NTSC-U) for late-generation titles with save issues, SCPH-50000 (v1.70 NTSC-J) for Japanese imports, and SCPH-75004 (v1.90 PAL) for European exclusive titles.

This five-BIOS setup covers every situation without switching game regions or reconfiguring any emulator settings.

Common BIOS-Related Errors and Their Exact Fixes

Black screen after selecting a game: Most commonly caused by a BIOS region mismatch. Check your game’s region code on the disc label or ISO filename. NTSC-U games need a USA BIOS. NTSC-J games need a Japan BIOS. PAL games need a PAL BIOS. Switch to the matching regional version and relaunch.

BIOS file not detected by PCSX2 (no green checkmark): The file is either corrupt, renamed from its original output name, or missing supporting files like rom1.bin. Rename the file back to its original BIOS name. Confirm all supporting files are in the same folder. If PCSX2 still does not detect it, re-dump or re-download the file.

Save data not writing correctly or disappearing: This is a known issue with v1.60 and v1.70 in some titles. Switch to v2.00 or v2.20, which includes save system fixes. Also, check that your PCSX2 memory card folder does not have Windows read-only permissions applied to it.

Game runs too slowly or stutters after loading: Using a v2.20 BIOS on low-specification hardware adds overhead that older BIOS versions do not. Switch to v1.60 or v1.70 for better performance on lower-spec devices. Also, confirm your graphics renderer is set to Vulkan or OpenGL rather than Software mode.

Audio out of sync on PAL games: PAL game running through NTSC BIOS. Switch to the matching PAL BIOS version. In PCSX2, also enable Audio Stretch in SPU2 settings as a secondary fix.

Game loads to BIOS menu instead of starting: This happens when Fast Boot is disabled, and the game requires the memory card screen. Enable Fast Boot in Settings > Emulation. If the game specifically needs Full Boot, leave it disabled and let the PS2 browser screen appear before the game loads.

Frequently Asked Questions

Which PS2 BIOS version is best overall?

For most users, SCPH-70012 (NTSC-U, v1.90) is the single best all-around choice. It covers the full PS2 library reliably, performs well on all hardware tiers, and is the version recommended by the PCSX2 development team.

Should I use a newer or older BIOS version?

Newer versions (v1.90, v2.00, v2.20) are better for most users because they cover more of the library and include important bug fixes. Older versions (v1.60, v1.70) are preferable only for early launch titles or on very low-specification hardware where the newer BIOS overhead causes performance issues.

Can I use a USA BIOS to play Japanese or European games?

Some games work with a mismatched BIOS due to loose region checking, but many will not boot at all, and those that do run may have speed or audio sync issues. Always use the BIOS that matches your game’s region for correct behavior.

Can I have multiple BIOS files in PCSX2 at the same time?

Yes. Place all .BIN files in the same BIOS folder. PCSX2 lists every detected version and lets you switch between them in seconds. This is strongly recommended for anyone who plays games from multiple regions.

Does the BIOS version affect game graphics quality?

No. Game visual quality in PCSX2 is determined by the internal resolution scaling, texture filtering, and renderer settings — not the BIOS version. The BIOS affects compatibility, stability, and system behavior rather than visual output.

Why does PCSX2 show a green checkmark on some BIOS files?

The green checkmark means PCSX2 has matched your file against its internal database of verified, unmodified PS2 BIOS dumps. Files without a checkmark may still work, but have not been verified. Red icons indicate corrupt or invalid files.

What is the difference between the BIOS versions for PCSX2 and AetherSX2?

There is no difference. Both emulators use the same standard PS2 BIOS .BIN files. The same SCPH-70012 file that works in PCSX2 on Windows works identically in AetherSX2 on Android.

Is a newer BIOS better for older games?

Not necessarily. Some launch titles from 2000 to 2002 were programmed specifically for the v1.60 firmware behavior. Running them on v2.20 occasionally produces subtle differences. This is rare, but it is why serious emulation users keep multiple BIOS versions available.

Final Recommendation

For the majority of PS2 gamers, the answer to which BIOS to use is straightforward. Download SCPH-70012 (NTSC-U, v1.90) as your primary BIOS. It covers the full library, performs well on all hardware, and is the version the PCSX2 team itself recommends.

If you play games from multiple regions, add SCPH-50000 (NTSC-J) for Japanese titles and SCPH-75004 (PAL) for European exclusives. If you experience save errors on specific titles, switch to v2.00 or v2.20. If you are on low-specification hardware, try v1.60 for better performance.

Keep multiple versions in your BIOS folder. Switching between them takes seconds and gives you the flexibility to run any PS2 game from any region at its best performance.

All PlayStation trademarks and copyrights belong to Sony Interactive Entertainment. This guide is provided for educational and informational purposes only.