"The operating system on your device is modified in an unauthorised way" System Update error on android device.
This option wouldn't work on rooted device, but it can be solved if you unroot the phone.
How to unroot your phone click here https://www.youtube.com/wat...
1. Power off the device and access recovery mode
2. Use "Wipe cache partition "
You can also use " Wipe Data/ factory reset" , if this method doesn't work. find the procedure in the 2:26
3.use "Reboot system Now" for normal start up.
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