I've never done a 2.6 downgrade although I know it can't be a factory 2.6 or a ta-082 motherboard.You should google psp 1.5 firmware update and something called psar dumper at least I think it's called psar dumper-this will decrypt the firmware for you could be wrong though.If you are really having trouble just and can't get it to work just pm me and I'll do the research to make it happenI've only downgraded 2.0's-about 6 of them and this would be worth knowing how to do.Also be very specific in you google searches it helps
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