The operating system on your devices has been modified in an unauthorised way.

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Sep 21, 2016 6:54:11 AM via Website

Can someone help me?
I rooted my Samsung Galaxy Mega 2 to play Pokemon GO using fake GPS. I root it using KINGO ROOT. But after a while I unrooted it using the same app and everything seems normal. But oneday my camera app failed and after doing some research, I must upgrade my latest phone softaware.
But everytime I check for updates, an error message appear. Here's the message:

The operating system on your devices has been modified in an
unauthorised way. Try donwloading software updates using Samsung Kies
on your PC or visit a customer service centre.

What should I do?
I already use Samsung Kies but I think it didn't worked.
Need help!
Thank you!

Bastian Siewers
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Sep 21, 2016 10:33:30 AM via Website

Hi Theo, welcome to AndroidPIT!

As soon as you root your phone, the standard procedure of updating the software does not work anymore.

So you need to install it manually through Odin. Check out this thread on XDA-Developers to find all the instructions you need.