Hi there. I'm totally new to PSP modding, and I need some help with modding a PSP 1000. This one belongs to my cousin, and they paid someone to mod it. So, I don't know any details about the PSP's modding history. But from my modding attempts using the guide, it seems to have been downgraded when it was first modded as I couldn't update to 6.60 when I flashed an OFW 5.00 using Hellcat's Recovery Flasher. I had to pay someone to mod it again using a Pandora's battery and ended up with a CFW 5.50 Gen-D3. TL;DR. I have a PSP 1000 with unknown history. Prolly have a patched Key 5 and am currently on CFW 5.50 Gen-D3. I've already made Nand & Keys backup using NandTools. I've also fixed (according to KeyCleaner) the PSP's keys. However, there was a warning that unpatching key 5 may cause a brick. So, my question is, will unpatching Key 5 while on CFW 5.50 Gen-D3 brick the PSP? And if it would, what should I do to unpatch it? Btw, updating the PSP directly to 6.60 doesnt work cause it says the PSP's currently on 9.90.