The team announced in January to be at work on a new update to the Custom Firwmare 5.50GEN, remember that it's installed on all PSP-1000 and PSP-2000 (except TA-088v3). This update C will launch several UMD / ISO, in order to work properly, require the 5.55/6.00 firmware without having to patch in which the procedure is necessary to use the recent Game Decrypter.
The release is scheduled for Sunday evening. So stay with us for updates.