1.50 failing to upgrade

plz help me,i had ma psp runnin 2.71 firmware nd den i downgraded to 1.50 now when i try to upgrade to 3.52 m33 i get dis error
SHA1 of 3.52 psar doesn't match expected
press x to exit.

[ace]

Ok, what tutorial are you following? Also, are you sure your upgrading to 3.52M33-1 and not 3.52M33-4?

I'm following da tutorial dat comes wit da 3.52M33 custom firmware zip file

[BKFraiders7]

Did you run the patcher? If not then run that. Then download the 3.52M33 file. Place it in your GAME folder. Download official sony 1.50 and 3.52 files. rename 1.50 to 150 and 3.52 to 352. Put those 2 inside 3.52M33 folder. Run the thing and then your done.....We will help with the update 4 when your done with that.

Thanks 4 all ur help i finally got it workin

[BKFraiders7]

good....No prob helping either.

Also, have you gotten it up to update #4? if not then thats where you need to be.