Meizu 15 rom/update problem

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2018-09-20 02:44

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Hi,
I bought Meizu 15 and it came with modified custom ROM 7.0.2.0A with multilingual and google services already installed by the shop, virtually firmware A turned into a firmware G.
The annoying thing is that i can not update my phone. I have no access to the update menu with this modified version of the ROM.
Also some apps wont work as its telling me the device is rooted. I myself did not root it so it came from the shop.
How to make properly upgrade to G rom or revert back to stock A rom without bricking my phone or lost imei?

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