OpenWrt installation on Xiaomi Mi WiFi Nano (R1CL)

Hello friends...

I have a question ... I have a Xiaomi nano r1cl router https://openwrt.org/toh/xiaomi/nano And I would like to update it to OpenWRT.
I have a question, how should I do it, can I do it like in tplink ?? Select in the administrator options update ??

Second question. Is this firmware suitable ??
http://downloads.openwrt.org/releases/18.06.5/targets/ramips/mt76x8/openwrt-18.06.5-ramips-mt76x8-miwifi-nano-squashfs-sysupgrade.bin

I don't want to kill my router;)

For downloads and installation instructions see the Xiaomi Mi WiFi Nano devicepage:
https://openwrt.org/toh/xiaomi/nano#installation

for my part

  1. ssh root@192.168.1.1
  2. scp YOUR-FIRMWARE.bin root@192.168.1.1:/tmp exec on your pc
  3. cd /tmp && mtd write YOUR-FIRMWARE.bin firmware
    my problem
    can't open 'u-boot' device when flash breed.bin to u-boot
    a method is flash firmware with unlock