How to unbrick Xiaomi MiWifi Nano, in case I screw up?

OK, i just got a new Xiaomi MiWifi Nano but before i go any further of installing OpenWRT, I wish to know how to unbrick it in case I screw it.

Can we use TFTPD method like the way we use it for TP Link TL-WR841N router?

Have a read under the heading HACK in the link below for recovery details

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I'm stuck at step 5 under "Installation via SSH", while executing the below

root@XiaoQiang:~# wget
Connecting to (
Connecting to (
wget: can't open 'openwrt-ramips-mt7628-miwifi-nano-squashfs-sysupgrade.bin': Read-only file system

What does it mean by read-only? Btw, I'm using Windows 10 to do all this. I downloaded curl from

Nvm, i got it. I gotta run the wget comman under /tmp folder