Hello everyone, First of all, this will be my first post / call for help here, so please don't go harsh on me I recently bought a Powercolor 6950 PCS++ GPU. I've read from several different sources that it's 2nd BIOS has a natural 6970 unlock by itself (both as in shader count and clock speed). So I was eager to try it out, flicked my bios switch to the other position and booted the PC. I downloaded the latest version of GPU-Z from techpowerup, and opened it to find out that it also had 1400~ shaders and 800mhz clock speed. I shut down the computer, flicked the switch to the other bios, checked GPU-Z again: still the same. So basically, both of the bioses in my GPU are essentially the same. I tried to flash it myself with the regular method, followed the guide here, however Winflash gave me the error "subsystem IDs mismatch". I tried to unlock the rom using command prompt, then the flashing worked. However, when I booted up my PC, nothing happened, the monitor didn't get signal, and weirdly my mouse and keyboard didn't "light up" aswell (I assume this is called as "bricking" the BIOS). I booted up my system from backup bios, and resetted the bricked one using the techniques found in the same guide above. Finally, I'm still using the 6950 shader count and clock speed. If you've read everything I've described above, firstly I want to thank you. Yet, I have a few questions about all these: 1- What was the reason of "subsystem IDs mismatch" in the first place? Does my GPU have a different "subsystem ID" (whatever that is) because it's a modded GPU (PCS++ thing)? 2- After unlocking the rom manually and flashing the card, was the reason of my system not booting really the GPU bios? It just felt like a power supply problem (even though there is no reason why it should be so) 3- If another 6950 PCS++ owner gave me their second bios, ie. the 6970 one, can I successfully flash one of my bioses to that? If so, please someone PM me with their stock 6950 PCS++ 2nd bios (the 6970 one). Thank you!