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 ?

[19667]

can u tell me the custermization number u can check it follow this and tell me what it is ok

go tothe dial pad and type *#*#7378423#*#* then go to service info >>software info now there is a custermization number tell me it

[hoomanino]

I update it whit sony update center, then I repair whit PCCompanion and still nothing change

thene i use flash tool and flash with some roms....

[19667]

ok tell me the custermization number

[hoomanino]

custom ver number:1281-2115_R4A

but on my phone box is : 1280-5944.4 

[19667]

ok is your model 4G one or 3g one

[hoomanino]

LTE version , d6503.

but I can't use LTE in iran!

option in network mode ( WCDMA only , GSM only, WCDMA (preferred)/GSM and LTE(preferred)/WCDMA/GSM)

[19667]

ok do u have latest flash tool version 

[hoomanino]

yes last version....

[19667]

ok download your latest ftf 17.1.2.A.0.314 in here and flash you 4n and try ok flash it.i think it will we ok try this this is the same custermization number in ur 4n ok 

Do not forget to give kudosand to select the correct answer 

[19667]

if u will not able to fix it tell me ok.have u flash it