Fake Xiaomi Redmi 2 :/

I bought a Xiaomi Redmi 2 on ebay, once i got it i tried to flash it to put it with a rom in my language without success. So i started to explore the phone and look for info about fake xiaomi phones, so i realize it's a fake and opened a dispute on paypal with the seller.
The volume buttons are hard to pressure. No hologram in the battery, the Imei and SN in the box didn't match the phone. Besides other "small details"....

How can i flash it and install a different rom? The phone seems pretty good for a fake.

Antutu benchmark: 23017
CPU: 3348
GPU: 1301
RAM: 1365
I/O: 812

Here's the specs of it in aututu: