I purchased an unlocked STL-001 Z10 with 10.0.9 bundle 2372 from Dubai in March and have been currently using it in India over Bharti Airtel network. I started getting updates for the new OS 10.1.0.273 to be installed on my phone. I recently updated my OS and ever since I'm unable to access my settings menu, through the icon or through pull down from home screen. Basically,this error has rendered my phone useless. I've been reading up on support forums about the problem and I've seem to have realised what may have been the reason for this. This maybe happening because my current carrier has not released the newer update for the os. I'm looking for solutions to downgrade, or even better, solve this problem within the current version of os. Right now,it says on bb link, that my software version is 10.1.0.273.