Custom Firmware from 3.9 to 5.0(Help)

First, I've donwloaded, NBA 2k10, and it works for 3.9 version.

But now, I've updated my custom firmware from 3.9 to 5.00.


Unfortunately, I can't open now my games especially the 2k10 game,
and this one appearing
(This game could not be started.(80010013)).

What seems to be the problem? Can you possibly help me on this? Thanks.
Edit/Delete Message

[BKFraiders7]

try going into the CFW mainscreen (hold down R (or LR i dont remember)when you boot up your psp..like pull the battery and do it). Then change what firmware it says

What ISO loader are you using? Press select while on the XMB and switch between the loaders.

try going into the CFW mainscreen (hold down R (or LR i dont remember)when you boot up your psp..like pull the battery and do it). Then change what firmware it says

it was "hold down R"

yeah id say set your ISO mount to either M33 or SONY(other number here)

I think the Sony (NP766 or w/e) driver is the best one, I have always used it and have had no problems loading games.
I'm thinking the OP might be using a different one.

thanks for reminding me the numbers, sony np 987 (close enough) you get the idea, right?