Xperia S giving problem after ICS update

[harpreet936]

I purchased Xperia S a month back with default ROM GB, unfortunately i clicked ICS update and my phone got updated to ICS. But after update ICS have too many bugs like delay in opeining Dialer, wifi problem and the main Proximity sensor missed to get active in 2 calls out of 50 calls. This problem occurs twice in 50 calls. I had been following up with Sony service centre, according to that degrade to GB is now discontinued and cannot be happen, as these problems were not there in GB.

Please help me to resolve the issue to how revert the original GB rom

[harpreet936]

1. Unknown resources - no need in ICS version, but debugging option is mantdry

2. yes i have used indian rom, working fine

3. yes, it will automatically inform you via OTA that updates are available. And if u try from PCC or SUS it will start updating ICS

4. Unlocking bootloader allowed - means ur handset allowed to unlock the bootloader if you want to unlock.

And you dont need to unlock loader, the system will automatically flash the system without doing so.