Anyone having trouble updating to Kitkat every time I try on both my phones it stops at about 30% then tells me update failed. Any ideas what problem is?
A typical reason for the update failure is KK looks for any changes in the OS. If it detects any the OTA update will fail. On the about phone screen does it say normal or custom?
No, flashing will just return the device to 100% stock out of the box. It will allow the phone to update and will not void any warranties or things like rooting.