Guys i searched it on the forum and i didnt find this idea on any other thread, so im sorry if we already discussed this!
Well this idea maybe is stupid cuz its simple and im almost sure that people have already tryied it out..
Here how it is:
We take 2 MS and put the 1.52 update on one MS and the 1.5 update on the other one. It must be one the same directory (i think it has to be anyway)
Well than we run the 1.52 upgrade but change the MS before it starts so it will downgrade your psp to 1.5
Its very risky and i dont have any idea if it works, and i dont have 2 MS, cuz i would try it if i had!
(Sorry about my English and Call me idiot if its a dumb idea!)