i have a psp with custom firmware 3.03oe. my psp version before is 3.03 sony firmware if i want to downgrade it do i need a gta umd? or i only need to put a recovery file to my psp. thanks Runs Unsigned Homebrew - Custom firmware allows unsigned PSP homebrew to run, which is important since signing is a new thing. Otherwise, the PSP will claim that the homebrew is "corrupted". Plugin Mode - Extend the abilities of your PSP with PRX Plugins. Device status will become "Custom/Modified", instead of "Official"; SAMSUNG AND SAMSUNG ONLY. THIS IS A GENERAL GUIDE. NO GUARANTEE ON ANYTHING. DO IT AT YOUR OWN RISK. SamMobile may be the best choice to download stock firmware of Samsung device. Or you can go to Samsung Updates Custom firmware on a PSP slim.? Okay, i am thoroughly confused I need someone to give me a COMPLETE guide to installing custom firmware on a PSP slim currently running on firmware ver. 3.72. A PSP ® (PlayStation ® Portable) system with battery pack and AC adaptor A UMD™ containing update data* *When you insert a UMD™ containing update data in the system, the following icon is displayed in the home menu under (Game). Follow the steps in this video, and you should be on your way to getting custom firmware (CFW) on your PSP 3000. This makes use of software called ChickHEN. Always the first with new, official Samsung Firmware. Read first We recommend using Samsung's own utilities, Samsung Smart Switch and OTA (Over-the-air), to upgrade devices. Use SamMobile only if you are 100% sure about the risks involved in flashing your device. This is a Modified version of Pro Custom Firmware 6.61 which is compatible with PSP and PSP Go System . Feel free to read the information below as well visit the developer site if listed for more information about this latest Custom Firmware known as Pro 6.61 Pro-C Infinity for the homebrew community. you will need to flash your PSP with custom firmware To do this you will need to buy a Pandora battery as well a