Yoshihiro has released a patch that makes Ahman's iRShell compatible with with the latest Custom Firmware 5.50GEN-B2. All you need is the latest copy of iR Shell and the patch and follow these instructions.
- must be present on your PSP, the latest version of iR Shell available
- Copy the folder 550 in January irshell PSP / GAME
- Start the patch
- Press to patch irshell