Avoid restoring system apps and system data with Titanium Backup –
these can cause stability issues that are very hard to debug. If you
believe you know what you’re doing – then fine, go ahead, but please
don’t complain if you experience strange behavior.
PREREQUISITE FOR OTA:
If you are going to flash OTA then you need TWRP recovery installed in your device.
You can flash through CWM also, but you need to download the update file and flash it manually.