Team M33 has once again updated their Custom Firmware, making it their sixth update. This update isn’t major and simply adds a new “noumd” mode to the Recovery Menu. 3.51 M33-6 now allows you to make use of the Sony NP9660 ISO loader to run ISO images. The team state that it should improve ISO compatibility, however, the exact compatibility information is not know.
Instructions on how to update are included in the ZIP package. Please make sure you have 3.51 M33-5 already installed before attempting to update.