Xiaomi r4ac bricked when trying to reset openwrt

Hi all,
This is a tough question:
I already installed openWRT on my xiaomi r4ac (100mb) router.

  1. tried to set it as a wireless bridge but somehow nothing was working, and i only had access with CLI.
  2. tried to do soft-reset, but all the commands I tried finished with "rootfs_data" not found.
  3. tried to just install the openwrt bin file from there again, and maybe disconnected the power too fast.
    now the router is stuck with something looks like a loop: orange led on, then blink once, then on and again and again....

from now, nothing i tried worked...

Please help me get something out of this situation.. :pray: