Problem with install OpenWrt for unifi ac

hi there i want to install openwrt / lede to my unifi ap i upload the firmware to it by winscp in /tmp/ but when theres

mtd write /tmp/openwrt-ar71xx-generic-ubnt-unifiac-lite-squashfs-sysupgrade.bin kernel0

its didn't work and i get failed message why ? i do it with unifi ac mesh and unifi ac lite its same problem

i use this link to do it



i don't own this device. But anyway Some thoughts of mine:
The URL you posted is "out of date" , the actual URL for this device is:

The Information you give could be more detailed, e.g.
what exactly are you doing , step by step.
Is there more Information then just "failed" , which you could post ?
The more details you give, the better someone can give detailed hints.

And: do you suffer from this ?

If mtd is missing on your device downgrade the stock firmware to a version before march 2017


thank you my dear for your reply yes the problem is mtd missing thank you for your help