I just tested both installations on my PSP-2004 ta085v1 with excellent results.I installed before the CFW 6.39 ME-3, this has the possibility to load the Original FW 6.39 by pressing the HOME button in the startup of the PSP ...Loaded Original FW 6.39 I booted the installation 6.39 PRO-B6 , this install different files from ME-3...repeat installation 6.30 ME-3 for fix...In doing so I have both the flash0 of CFWs...I turn on the PSP with the HOME button pressed load FW 6.39, hence I use FastRecovery PRO-B6 that loads its files from flash0 ... or I turn off and turn on normally so I 6.39 ME-3 in me PSP, but those who use the HEN could use both versions of the launcher and fastrecovery after the double installation...ALL EXCEPT the PSP GO 05g... by Notonlyeyes
It DOES work, I just tried it. But it's 3 fw's not 2(OFW 6.39/6.39PRO-B6/6.39ME-3). It's kind of cool to be able to triple boot cfw/ofw on one slim psp. Thanks for this information.
ewan08, think of it as dual booting linux and windows, using lets say....using default windows boot loader. first you install 6.39me-4, then hold home when booting the psp. once you are in ofw, run the 6.39 pro-b6 installer, wait for it to do its thing. after that run pro fast recovery. pro-b6 will install different files in the flash0, so to correct this, you need to install 6.39me-4 again. now you're all done and you have successfully installed 6.39me-4 and 6.39pro-b6 into your flash0.
to boot into official firmware, hold HOME while powering up
to boot into 6.39me-4, power up the psp normally
to boot into 6.39 pro-b6, boot up your psp and run the pro b-6 fast recovery
Thanks...by Notonlyeyes