ISO Tool v1.956 is released. ISO Tool is a handy homebrew application that lets you manage and backup your UMD's straight from your PSP. ISO Tool completes by Japanese Developer Takka.

ISO Tool v1.956 Changelog:
[NEW] TAG: 0xD91617F0 decoding support
[NEW] ms / seplugin / prm / key.txt to add the settings 0xD91617F0
Changes to these files, iso_tool Prometheus3-v4 If you have changed in the decoding can be started without

Download: ISO Tool v1.956
Source: Here