Note 4 stuck in rebooting/struggling to turn on.

A

AC Question

For the last few days my Samsung Galaxy Note 4 has started rebooting (in a loop), and booting up to a 'Downloading - do not turn off target screen).

I've tried a factory reset which hasn't worked.

Samsung have said my warranty is void as apparently the device is rooted (it isn't AFAIK), and theres a very small crack/scratch on the camera cover.

In relation to rooting, the bootup screen does say its rooted. However, settings - about device - status gives me a device status of Official.

Could this be related to the battery, or would something like Odin help, or do I have a very expensive paper weight?

Any help would be greatly appreciated before I bite the bullet and order a new phone.