XGEN UPDATER DC + UPDATER + testing tool from Yoshihiro:
This tool let you install the firmware 5.50 GEN-B2 Full directly without any patch
and on any psp so PSP fat and psp slim TA-79 > TA-88V2 from any custom firmware or kernel exploit .
for the firmware 5.50 put your 5.50 updater on root of your memory stick renamed 550.PBP