[PATCH v4] ath79: add support for Ubiquiti PowerBeam M (XW)

[Joe Ayers]

> > I'm having a bit of heartburn with continuing with these instructions:
> >
> > > Flashing via stock GUI:
> > >  - Downgrade to AirOS v5.5.x (latest available is 5.5.10-u2) first (see
> > >    https://openwrt.org/toh/ubiquiti/powerbeam installation instructions)
> >
> > This issue was resolved with:
> >
> > https://github.com/openwrt/openwrt/commit/076d58d3440f382c536ea8874f58b0df23c263bc
> > https://github.com/openwrt/openwrt/commit/6009b3fd586a1fd91400074080afb9545c6cf7e2
>
> Those commits resolve the problem for TFTP, but if people want to use
> the GUI, they still need to downgrade, right? Both instructions are
> included in the commit message. Note that the TFTP instructions don't
> mention downgrading.

I remember flashing via the stock GUI in AirOS v5.6.? had worked.  As
I recall, firmware signatures were not required until a future AirOS
version .   If so, downgrading shouldn't need to occur all the way
back to v5.5.10-u2.  The AirOS release note history should tell us
when firmware signing was introduced.  I'm sorry, I don't have time
available to substantiate right now, to make sure my memory is
correct.

Would anyone ever follow the GUI flash with all the steps, when 1 tftp
flash works?    I suspect there is no impact regardless, might just
move forward, not worth the time.