My phone not registering to 2G (GSM only) network I am using a Sony Xperia Neo L (MT25i). After updating the OS, my phone not registering to 2G (GSM only mode) network. It works perfectly with 3G (WCDMA only or WCDMA proffered mode) network. While searching for network I can see all the 2G network. I try changed my SIM, but for all the SIM its the same. While googling many are reported this issue, but couldn't find a solution. I don't know whether I am posting this on right place. Since it happened after the OS update I am posting it here. My current Android version is 4.0.4

Update
I am from INDIA and my baseband version is 8x55A-AAABQMAZM-203028G-87. Does any one have other baseband on Neo L (MT25i)?
As it seems you have tried resetting to factory defaults and re-flashing same update, I believe the causes might be caused by updated baseband. I would try reflashing different original firmware. You can also flash baseband only via flashtool so maybe it might be worth trying to flash baseband from the firmware that worked. YMMV.

You can find links to download FTF (original firmware) for your device:


Build 4.1.B.0.587 - http://d-h.st/Vft
Build 4.1.B.0.626 - http://goo.gl/hAfwI
Build 4.1.B.0.631 - http://d-h.st/iVF


Sources &amp; more info:


http://forum.xda-developers.com/showthread.php?t=2047914
http://forum.xda-developers.com/showthread.php?t=1952333
http://www.flashtool.net/index.php