so once u've downgraded from 2.5/2.6 to 1.5 u dont have to upgrade back to 2.00 then downgrade back to 1.5 if u get tha "disk could not be loaded" error.

i see...
but would it be better if u upgrade back to 2.00 and downgrade back to 1.5 after downgrading from 2.5/2.6, like will ur 1.5 psp be more stable or its tha same?