touran22 Wrote:my vshmain compressed is 3.52 header but 3.51 edit and its working fine... does it matter if the 2 things are differnt FW's?

The main thing is (in) the header. If you use a 3.51 header the program creates the compressed prx header with 3.51 keys (or if you turn off 'Use vsh module keys' then with the used header original keys, but I think the compressed prx won't work in this way). In uncompressed prx/elf files - what you'll use as the data - the difference is only 1 byte between the different 3.5x firmware versions. Seems like it doesn't matter if the PSP firmware version and the compressed content firmware version in the prx file are different.

If you create a 3.51 prx you can't use on 3.52 for sure.