How to Stop OTA update for E4GT.
When, I got this E4GT, it was on 2.3.6, later on it got OTA updates & went to ICS, with that I had horrible experience of battery drain. Then, again I changed to stock ROM to 2.3.6, again it updated to OTA (yes, it asks your permission to update & we have an option to press "Later", but there is a high chance of accidentally pressing Yes & it updates). Again same battery drain problem started. then, I upgraded to Jelly Bean through PC, but problem of battery was identical as in ICS.
Hence, I changed it back to GB 2.3.6 & this time disabled OTA updates by following.
process is very simple & mentioned @ length here http://goo.gl/WajFrU
However, in simple words, it is copying a file FOTAKill.apk into /system/app folder.
Phone has to be rooted for this.
File is available here, whereas system/app folder can be accessed by ES explorer.
in ES explorer, you have to ensure "Mount R/W" in root explorer.
Other owner of this handset may have different experience with these OS, so can't say if this is a general problem.
FOTAKill.apk