Xiaomi stuck in fastbot mode while bootloader is locked

I've found my Xiaomi redmi note 4 stuck in fastboot mode after the battery had died. I tried different ways to unbrick it but nothing helps. The list of ways I tried:

1. platform tools fastboot binary. fastboot reboot bootloader - still
   rebooting to fastboot.
   Also, adb binary doesn't recognize my device.


2. I can't use mi unlock tool because it doesn't see my phone.


3. Miflash doesn't recognize the device also.

Are there any other ways to unbrick it?

Edit: It's Mediatek Helio X20