i had 2.6 firmware.since i don't have gta i upgraded my psp to 2.71 (it's not ta model,i checked it).then i run that new downgrader which worked after i restarted psp several times.screen wend red ,memory has been flashed.i restarted psp again,blue screen popped out (the one that says there is something wrong) which i cancelled by pressing circle button.then psp restarted again with my 1.5 firmware ready to be configured.that's it.couldn't be easier to downgrade,i tell ya!
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