Do not worry, from Play Store install CPU-Z, you'll see that the devices and everything ok. Then you install a new ROM, and you have no more doubts Friend
I bought my mi4c from gearbest also, and came with 77.0.4.0 miui rom, i updated him to china stable 7.0.16.0
Anyone can tell me if this version locks the bootloader? Or is just the developer rom? If i change the rom to the developer 6.1.7 i can install twrp and flash the xiaomi.eu 6.1.14 without brick risk?
Thanks