cxmb problems

[gr333nb00dah]

I just upgraded to 5.50 GEN-B2 and when i enable cxmb it won't boot. I'm pretty sure this is because I've replaced the custom themes as default a few times back when i used 5.00 m33-6. If there is a way to get the original themes so i can use cxmb. I don't mess with flash that often but i have a good idea its just a matter of replacing the original over these. If you could direct me to the correct tutorial, or just send me the files and help me along that would be great.

I know before i updated i was advised to set themes as original, but hey i made a mistake...so please if anyone could help it would be great. (btw im using a psp 1000)