Help! Problem with total flash.

Hi all!

I'm new in flashing phones, and I've got a problem:

I extracted my phone flash and I program it again with the file I got, and my phone started to fail. It loses coverage after using menus, and recover it in a minute aprox. Also, I can't see battery charge.

The phone is a 3210.

Thanks in advance, and sorry for my poor english. I'm spanish.

Use the NFREE1.2 prototype to calculate the checksum.

I used it, but it didn't work. Checksum is not the problem. No "contact service", just "phone goes crazy"