No specific info about version 2.3. Please visit the main page of PSP ISO Shrink on Software Informer.
PSP ISO Compressor is, well, an ISO compressor for the PSP.
CSO-DAX Compressor compresses ISO files with PSP format.
Shrink O’Matic is an AIR application to easily batch resize or shrink images.
Shrink O’Matic is an AIR application to easily (batch) resize (shrink) images.
It can convert DVD, VIDEO_TS folder, ISO files to PSP MP4, H.264 video format.