is it possible about firmware upgrade?

[n_nice]

i am now using a n73 with general version 2.0628.0.0.1 and code 0539696, if i change to a IE code and upgrade to IE version (3.0638.0.0.43). is this possible to change back to the origenal code and "upgrade" firmware version from 3.0638.0.0.43(IE ver.) to 3.0638.0.0.1(General ver.) by NSS and NSU?

can i do this without know by Nokia (can i keep my warranty?)

[lovesign]

You can upgrade, but you can't downgrade.

[zac2]

Originally Posted by n_nice

i am now using a n73 with general version 2.0628.0.0.1 and code 0539696, if i change to a IE code and upgrade to IE version (3.0638.0.0.43). is this possible to change back to the origenal code and "upgrade" firmware version from 3.0638.0.0.43(IE ver.) to 3.0638.0.0.1(General ver.) by NSS and NSU?

can i do this without know by Nokia (can i keep my warranty?)

The answer is no using the NSU and yes using Pheonix as long as you remain in the same firmware version. You will find the solution on gsmhosting.com forums.