How can I downgade the OS?
I had downloaded the OS version that corrects the Z10 rebooting error but have had my Z10 heating up and having extremely poor battery life. Battery lasts 3hours or less now and all I don't is chat for a few mind on BBM, although i have emails, Facebook and Twitter running. I had all that running before the upgrade too so very easy to detect the drop. I've tried to return to the OS10.1.0.273 but each time i do a swipe and restore to factory settings, it has the same latest OS updated on it, hence nothing improves. Can anyone tell me how to restore to an older OS rather than having the latest junk on my phone?