psp go 6.60 ofw -cfw 05g

[pspmixer]

im trying to put cfw on my psp go but cant find a permanent cfw got it on 6.60 ofw
tryed using 6.60 PRO-B10 but when i turn it off it goes off again

ive found a downgrader for 6.60 to go to 6.20
but i dont think the ofw 6.20 wont recongise on my go
i only get the genesis competition eboot in game xmb folder

DOWNGRADE PSP GO 6.35 6.38 6.39 6.60 to 6.39 6.35 6.20 (NO PANDORA) - YouTube

any help on this
links to downloads if possible thanks

[pspmixer]

tried serveral downgraders now none work
every time this has happened-
i launch downgrader from game xmb on psp then press x twice as it says to do on screen
then reboot me back to xmb with error message 'the game could not be started.(80010002)'