Well my friend wants to run Doom on his PSP. I've heard of Doom for PSP, but I don't know where to get it. I have all the WAD files though. My friend has 2.6 firmware. Is there a 100%-bricker-proof downgrader to a homebrew safe version? Also he wants to run Loco Roco on his PSP, but it needs a firmware update. What can I do in this situation? Are there any risks involved? Do you have any detailed instructions?