On the heels of Spanish 'scene' starting to flow with new blood and power, we have seen recently on Github that a Spanish developer by the name of Matercrack has recently released a neat tool for playing with the dev_flash files.
The good thing with his version of the tool, is he claims it might even be possible now to re-pack the dev_flash files into your PUP file, there been other tools out there, but some were not easy to use and most didn't unpack or re-pack at all, personally I have not tested it to see what improvements it offers, but here is his translated README:
This is a script used to unpack and pack the PUP dev_flash the team using tools fail0verflow, kakaroto geohot and, although modified a bit for better performance.
Instructions:
Put these tools in a folder called flash-Des-Emp_dev
You need to have unpacked the PUP
Extract the files in the folder update_files.tar script
Run the script and ready
Notes:
This script creates 3 ​​folders dev_flash, dev_flash_temp dev_flash3 and the first two are simply dev_flash fully unpacked and the third is the creation of folders dev_flash .* files, this could change what you wanted (I AM NOT RESPONSIBLE FOR ANY DAMAGE THIS TOOL MAY CAUSE) and modify the script to skip to step packaging.
WARNING:
I AM NOT RESPONSIBLE FOR ANY DAMAGE THAT THIS TOOL MAY CAUSE, SO BE VERY CAREFUL
As the author states above, this tool is for serious developers only, and hopefully it will help improve what we have out there already for normal users to install on their Jailbroken PS3 Consoles, but lets pray this does not start another round of GitHub Take-Down Notices by Sony's MIB Team!