Evo ga sa TopSony foruma kako napraviti full firmware backup:

Making a Firmware's complete Backup ( erom + main + fs + gdfs )

This option is very interesting, you can accomplish one of his firmware's complete backup, with all the configurations, settings of Internet, contacts, patches been applicable, CDA, personalizations in general, if some problem occurs, you won't need to install everything again, almost to use backup's file and finished. It won't be necessary neither same to copy the certificates, because the backup includes everything, EROM+MAIN+FS+GDFS.

This file only just will work in the original phone, will not work in no other phone.

In order that the file be valid, the address of reading of Start and Lenght of the file has to be the correct for each model of phone. The file generated has 32 MB'S size approximated, and it will be saved within the program's directory FAR, with a name similar to this: 35682800888888_44000000_021000000.raw

Address of Start and Lenght of full firmware's file:

W800 - K750 - W550
Full Firmware - 44000000 - 02000000