ZiNgA BuRgA has released what he calls RCO Icon Editor v1.05. Firmware modders will find great interest in this Windows app…
Whether or not you knew this, many of the RCO files found on the PSP’s flash contain icons which can be customized. And knowing that, this tool aims to function as a generic RCO icon editor. Now anyone can easily customize XMB icons — menu icons, battery icon, etc…
The RCO must be decrypted first; this can be achieved by using a tool such as PSAR Dumper.
I cannot stress enough… Read “readme.txt” for important information.
Firstly, this has ONLY BEEN TESTED ON 3.03 OE-C and 3.10 OE. I believe it _should_ work on all 2.71 SE and 3.0x OE. For 3.10 OE, customized topmenu_plugin.rco files won’t work, but it seems that customizing other RCOs (eg opening_plugin.rco) still works.
Also note, ALWAYS keep a backup copy of the RCO, incase either you or the program stuffs something up.