[FS#662] Sysupgrade messes up Ubiquiti Unifi AP AC Lite

[LEDE Bugs]

The following task has a new comment added:

FS#662 - Sysupgrade messes up Ubiquiti Unifi AP AC Lite
User who did this - Bjørn Mork (bmork)

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I believe this is exactly the same issue I had with my Ubiquiti Unifi AP AC PRO.  See the forum thread at https://forum.lede-project.org/t/solved-ubnt-unifi-ac-pro-partition-problems-kernel0-vs-kernel1/1944

I believe there are 3 minor issues that should be fixed here:

  - LEDE images should make both firmware partitions writeable by default, as well as the "bs" partition 
  - Initial installation instructions should describe the "bs" partition and provide a way to make sure it points to the firmware partition where LEDE is installed (which must be "kernel0" with the current images)
  - the sysupgrade script should verify the "bs" partition content, making sure that the newly installed image is used on the next boot

The first point is currently the most critical, as any device booting LEDE from "kernel1" is currently impossible to upgrade without using the mtd_rw trick/hack or a serial console.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=662#comment2456