Signal Problem after update

[hoomanino]

Hi,
After update My Xperia Z2 to 4.4, my device lost it signal (can't make phone call or mobile data connection), I did updated my phone to last available software ( 17.1.2.A.0.314) and my problem still exist.

Anybody got the same problem or clue ?

[Uliwooly]

could you try a brand new micro SIM card?

[Jake-SonyXperia]

Hi Hoomanino,

Welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

Are you able to clarify what troubleshooting you have performed so far? this will help us determine the best course of action.

I apologize for the inconvenience this may cause.

[hoomanino]

I just update from sony update center (90mb) then after restart network lost!
and I flash with flashtool and official roms to some another version but signal problem doesn't fix
I'm from Iran, and here we haven't LTE support. I think my problem is change in baseband version and if baseband change into before update problem will fix
(sry for bad English)

[hoomanino]

how I can to change my baseband version and use simcard 2g and 3g? 

[Uliwooly]

Is your phone compatible with network's frequencies?

[hoomanino]

my phone doesn't have any signal after update....

[19667]

ok now goto settings>>more>>mobile network>>network mode then select 2g or 3g and check it

Do not forget to give kudosand to select the correct answer 

[hoomanino]

I check it at first but still not working....

[19667]

what is ur generic