OFW 6.60 to OFW 6.20, cant get back to 6.60

[RurouniKeroro]

I am in an almost identical situation as the original poster here. Was there a solution found/determined? I also followed an old guide, downgraded using ChronoSwitch v5 from 6.60 to 6.20. I've tried to use 620PRO-C2 and get a perpetual black screen, I've tried to go back to 6.60 and I get the typical corruption message, I've tried Infinity, I've tried ChronoSwitch v7 and it says my firmware isn't supported. If anyone can help me at least get back to 6.60 that'd be amazing. I've been going at this for over two months and haven't been able to find a solution, I'm normally a member of Gbatemp.net but no one there has been able to help, trying to reach out to other communities. Thanks for your time.

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[toBsucht]

TA-095-Upgrader.zip http://www.mediafire.com/file/f2bu3rxzfvbr4oi/
This fix the ffffff error message.

Little tip:
Can you imagine how hard it can be to downgrade a perma patched psp to ofw, if you didn´t use longe amount of time.
So better use any temporaly cfw pro or Lme if pandora isn´t possible^^

On some installed cfw i had to run two ofw updateds to fix bugs on ofw related to downgrade

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