First - I'm sorry for my poor english

Sometimes sounds in my A620 BT are popping and crashing. Version of ROM is from beginning... 0.99.31 WWE. I try to update my ROM with file from turkish FTP. ROM is flashing, next the unit is restarting and popping is still there.
I have a file AD620N.nb0 and 32 MB CF card.
Is it possible to update ROM with the same version? Maybe the problem is with hardware? And is there explanation for this popping? In this version of ROM it was mended yet!
Thanks for any answers.