ISO Tool v1.979 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 v1.979 Changelog:
[BUG] (CSO) said thanks for popsdeco did not modify the response to non-2kb block size read by CSO
(Specified block size during compression, currently does not recognize anything other than 2kb XMB not supported)
[NEW] (CSO) added to specify the alignment during compression CSO. default is 4 (16byte)
(I write to significantly affect the rate of MS, UMD-0 and 6> different about twice the conversion rate conversion CSO)
[BUG] (CSO) Fixed headers may read correctly when read / write CSO
[BUG] (CSO) and various bug fixes related to CSO conversion
[NEW] (CSO) ISO larger than 2GB in size -> Support for CSO conversion
[BUG] (CSO) was fixed could fail to determine the threshold at 100% uncompressed
[NEW] (UMD) significantly modified the routine to convert ISO / CSO from UMD

Download: ISO Tool v1.979
Source: Here