ISO Tool v1.969 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 v1.969 Changelog:
[BUG] Menu △ "pspdecrypt.prx Update" is deleted because it was left
[NEW] menu △ "key.txt" Adding updates
[BUG] UMD does not contain, rename / Fixed freezes after update, etc.

Download: ISO Tool v1.969
Source: Here