I tried with qMp trunk, no problem flashing, configuration produced some headache but I went along. But afterwards probing internet access or even lan access results in crashes. Sometimes devices recovered sometimes had to be rebooted. Being a Noob I assume the lightest load leads to crash. There are quite a lot error messages in the system log which I can't interprete.
What I read from the log there could be a Vlan problem as well as automatic configuration of the wlan's fails at some point. 

Ilario <iochesonome@gmail.com> schrieb am Mi., 30. Nov. 2016 um 20:35 Uhr:
2016-11-30 19:38 GMT+01:00 Juergen Kimmel <juergenkimmel@gmail.com>:
> Hi all,
>
> got 5 of this dualband CPE (MT7620a). Tried QMP firmware, flash ok but
> crashes only by accessing internet.
>
> Anybody here got those working?

It is not supported by last OpenWrt stable, so it's not yet supported
by LibreMesh (you could try with the develop branch).
Looks supported by both OpenWrt trunk and LEDE trunk.
Did you try with these?
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