Current version: 0.2 beta
I have coded an Signed OFW application to load any Sony update or 6.39 CFW from the memory-stick.
I havent had time to test it yet but its signed to load on official firmware, so i dont know if it works?
It uses the 6.39 kxploit to gain kernel control then lets you load any Sony or CFW update from the memory stick.
For more info check the Readme file.
If you want to test it you can, but at your own risk.