98w ago - I have done this PS3 PUP / Dev_Flash File Spoofer v3 Tool (basically is an script that use other tools) long time ago for easily spoof necessary files from a PUP file or your own files of dev_flash. This works on Cygwin and Ubuntu (not CMD windows)
extractor.exe - Extract vsh.self, index.dat and version.txt of PUP file
spoofer.exe - Spoof your flash files [vsh.self and version.txt] (put there in same folder with spoofer.exe)
spoofer_pup.exe - Extract and spoof automatically files of PUP (it must be in same folder with spoofer_pup.exe)
You must choose what version and image version you want to spoof in tools spoofer.exe and spoofer_pup.exe, for example, if i want to spoof to 6.40 i put this on Cygwin console (you can choose any image version):
./spoofer.exe 06.4000 99999
./spoofer_pup.exe 06.4000 99999
When it finish you have your spoofed files in Spoofed folder. Version must have same numbers of characters, otherwise it give you error on PS3. If you do something wrong...