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0okm has released a 2.80 to 2.71 downgrader for motherboard models TA-079 all the way through TA-086. Although in order to get a copy you?ll need to email 0okm requesting it ? see source link below. Once retrieved, the steps are relatively straight forward:

1. on FW1.50PSP:
Download PSARDumper
Download PSP FW2.71 Update EBOOT
Download PBP Unpacker

use PBP Unpacker to unpack FW2.71 EBOOT.PBP
copy FW2.71 DATA.PSAR to ms0:\
run PSARDumper on FW1.50PSP then press circle to dump encrypted without sigcheck and decrypted reboot.bin.?
to Dump ?FW2.71 File?
2. on FW2.80PSP
Extract FW280DownDate2FW271.zip to ms0:\
check ms0:\F0 have 286 files and total size is 18,598,267 Bytes
PowerOff PSP to CleanReboot
Run xLoader on FW2.80PSP
then Run 2.71DDforTA-079~086FW2.80PSP

You can fetch xLoader here.

Once successfully downgraded you may proceed to FW 1.50 by using one of the supplied downgraders. TA-082 owners, ensure you use Dark_AleX?s TA-082 downgrader to avoid bricking your unit.

Perhaps we?ll see a public release in the near future.

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