A community remaster of a classic Assassin’s Creed title is leaving a growing number of players on Windows 10 and Windows 11 with a cryptic crash to desktop and the DirectX 12 error code 0x887A0006. The stuttering and instability hit the Resynced mod for Assassin’s Creed IV: Black Flag, according to multiple threads across Reddit, Steam Community, and the mod’s own support channels over the past month.

Users describe the game freezing momentarily before dumping them to the desktop with an error dialog that reads, “DirectX 12 error 0x887A0006.” The crash is often preceded by heavy frame-time spikes that turn smooth sailing in the Caribbean into a stuttery mess. For a mod that promised to breathe new life into a decade-old title with DX12 rendering, ray tracing, and modern graphical bells and whistles, this stuttering and crashing has become the dominant post-installation conversation.

What’s going on with Assassin’s Creed Black Flag Resynced

The Resynced mod is a fan-made overhaul that swaps the original DirectX 11 renderer for DirectX 12, enabling features like screen‑space ray‑traced global illumination, enhanced shadows, and higher‑resolution textures. But with that power comes fragility. The 0x887A0006 stop code is Microsoft’s DXGI_ERROR_DEVICE_HUNG, a catch‑all that means the GPU has stopped responding to commands and Windows has reset the graphics driver via the Timeout Detection and Recovery (TDR) mechanism.

In a DX12 title, the application is responsible for managing resources like video memory and command queues much more directly than in DX11. When something goes wrong – a driver bug, an over-ambitious overclock, a shader that compiles too slowly, or a race condition in the engine – the GPU can appear to hang. Windows then yanks the driver, the game loses the device, and you’re back on the desktop. For Resynced users, the hangs seem to cluster around two scenarios: during the initial shader compilation pass when the mod is building its pipeline cache, and during gameplay after 20-40 minutes, suggesting a memory leak or a thermal throttling cascade.

Reports on the mod’s Discord and the r/AssassinsCreedMods subreddit indicate no single GPU brand is immune. Nvidia users on anything from a GTX 1060 to an RTX 4090, and AMD owners from the RX 580 to the RX 7900 XTX, have all posted crash logs. Windows 10 and 11 both see the error, and the build number of the OS doesn’t appear to matter. The common denominator is the mod itself.

Why shader compilation stutter won’t go away

Even when the game isn’t crashing, many players report micro‑freezes that last 100-300 milliseconds – classic shader compilation stutter. DX12 and Vulkan titles often compile shaders on the fly, and if the developer hasn’t baked a pre‑compiled cache, the first time a new effect appears on screen the GPU has to pause and build the shader. The Resynced team implemented a shader pre‑compilation step that runs on the main menu, but several users say the process fails to complete or finishes too quickly, leaving dozens of shaders still unknown when the game begins.

This stutter can actually trigger the very device‑hung error we’re talking about. A prolonged spike in GPU load from a shader compile can push power consumption and temperatures high enough to cause a momentary instability, especially if the card was already on the edge of its factory overclock. It’s a chain reaction: stutter → power spike → GPU hang → TDR → crash with 0x887A0006.

What Microsoft and Ubisoft have said – and what they haven’t

Officially, neither Microsoft nor Ubisoft has commented on the Resynced mod’s crashes. Ubisoft’s support for Black Flag is limited to the original 2013 release, and the company has no responsibility for community modifications. Microsoft’s public documentation for DXGI_ERROR_DEVICE_HUNG suggests updating drivers, disabling background applications, and checking for overheating, but it’s a generic troubleshooting page aimed at developers, not a game‑specific fix.

That leaves the Resynced mod team as the only potential source of a real solution. So far, the team has acknowledged the crash reports in a pinned community post, saying they are “investigating GPU hang reports and will release a hotfix if a reproducible trigger is found.” No timeline has been given.

How to check if you’re affected

If you’ve already installed Resynced and are wondering whether the dip in frame-rate smoothness and the occasional black screen are related, look for these signs:

  • The game crashes to desktop with a dialog box containing “0x887A0006”.
  • After a crash, the Windows Event Viewer shows a “Display” warning with Event ID 4101, “Display driver nvlddmkm stopped responding” (or amdwddmg for AMD cards).
  • GPU‑Z or HWiNFO logs show the GPU utilization hitting 100% and the temperature climbing steeply in the moments before the crash.
  • The Resynced pre‑compilation bar at the main menu either never fills completely or fills in under five seconds (suggesting it skipped most shaders).

If you see any of these, you’re in the club. The good news: several workarounds have emerged from the community, and while none is a silver bullet, combining them has let many players finish long sessions without a crash.

Workarounds that can restore stability now

These steps are drawn from the most‑upvoted reports on the mod’s Discord and the Steam “Resynced Crash Megathread.” Apply them in order, testing stability after each.

1. Update your GPU driver and clean‑install it

A clean driver install wipes out any leftover shader cache that might be corrupted. For Nvidia, download the latest Game Ready driver from the GeForce website, choose “Custom Installation,” and tick “Perform a clean installation.” For AMD, use the Factory Reset option in the Adrenalin installer. Reboot before launching the game.

2. Increase the Windows TDR timeout

By default, Windows kills a GPU driver that hasn’t responded for 2 seconds. The Resynced mod’s heavy shader compiles can legitimately lock the GPU for a bit longer. Extending that timeout to 8 or 10 seconds often stops the crash. Warning: editing the registry incorrectly can cause system instability. Back up your registry first.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers]
"TdrDelay"=dword:00000008
"TdrDdiDelay"=dword:00000014

Paste the above into a text file, save with a .reg extension, and run it. Reboot. If the crashes persist, try a TdrDelay of 10 (decimal). You can undo the change by deleting both values or setting them to 2 and 5 respectively.

3. Force a shader cache rebuild

After a driver change or the registry tweak, delete the mod’s shader cache folder. In the Black Flag installation directory, look for ShaderCache or a folder named similarly inside the Resynced mod’s subfolder. Delete it, then launch the game and let the pre‑compilation run again. This time, observe the bar: it should take at least 30 seconds. If it zips through, the cache wasn’t emptied.

4. Lower in‑game settings that stress the GPU

The mod’s ray‑traced global illumination is stunning but brutal on even high‑end cards. Turn it off or to the lowest setting. Disable Nvidia HairWorks, AMD FidelityFX Super Resolution, or any other post‑process option that the mod adds. Drop shadow and volumetric cloud quality to medium. If you’re playing at 4K, try 1440p.

5. Cap the frame rate and enable V‑Sync

An uncapped frame rate can push the GPU into a power‑virus condition, especially on menu screens. Use the in‑game limiter or the driver’s control panel to cap at your monitor’s refresh rate, or 60 FPS. Turn on V‑Sync so the GPU isn’t rendering frames that never get displayed.

6. Run the game in borderless windowed mode

Exclusive fullscreen can cause driver timeout issues on some Windows 11 builds. Set the game to borderless windowed if the option exists; if not, add -windowed -noborder to the game’s launch arguments.

7. Close background hardware‑monitoring tools

MSI Afterburner, RivaTuner Statistics Server, and even GeForce Experience’s overlay have been implicated in device‑hung events with some DX12 titles. Exit them completely before launching Black Flag.

8. Try a different GPU driver version

If the latest driver makes things worse, roll back. Nvidia users have mentioned that the 537.58 studio driver exhibits fewer hangs than recent Game Ready branches; AMD users saw fewer crashes on Adrenalin 23.12.1. YMMV. Always use Display Driver Uninstaller (DDU) in safe mode when switching driver branches.

9. Disable XMP/DOCP or any factory overclock

Yes, it’s a last resort, but unstable system memory can manifest as GPU hangs in low‑level APIs. Temporarily run your RAM at JEDEC speeds (usually 2133 or 2400 MHz) and see if the crashes stop. If they do, you’ll need to fine‑tune your memory overclock.

What to do now if you just want to play

If applying the full litany seems overwhelming, start with the three highest‑impact changes: clean driver install, TDR delay increase, and ray‑traced GI off. For many, that combination alone cuts the crash frequency to once every few hours – still not perfect, but enough to enjoy the game.

Admins deploying shared gaming PCs in a LAN café or family setting might want to pre‑configure the TDR registry key via Group Policy or a provisioning package. The mod’s stability is not yet production‑worthy, so consider keeping a backup of the stock AssassinCreedIVBlackFlag.exe for patrons who just want to sail without tinkering.

Power users who are comfortable with special‑K or DXVK might experiment with a DXVK‑async translation layer to bypass the native DX12 path entirely, but performance will suffer and you’ll lose the mod’s visual upgrades.

Outlook: patches, community fixes, and what comes next

The Resynced team is small and works in their spare time. A hotfix could drop tomorrow or take two months. In the meantime, the community will likely produce a third‑party launcher that automates the shader cache rebuild and TDR tweaks – similar tools already exist for other DX12‑troubled games like Elden Ring and The Callisto Protocol.

For Windows itself, Microsoft has been gradually making the Graphics Kernel more resilient to hung GPUs, and the soon‑to‑release 24H2 update includes improvements to driver recovery. Whether those help Resynced remains to be tested.

Until an official fix arrives, treat the game like a finicky beta. Save often, watch your GPU temps, and if your captain goes down with the ship, at least you’ll know which error code to blame.