[FS#205] Cannot install LEDE on Ubiquiti PicoStation M2

[LEDE Bugs]

The following task has a new comment added:

FS#205 - Cannot install LEDE on Ubiquiti PicoStation M2
User who did this - Russell Senior (russell)

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Flashing back to 5.5.11, e.g. via the AirOS admin interface will write the older u-boot, after which flashing normally works.  Although ubnt.com's firmware download page doesn't link to the older files, if you know the filename, you can guess the URL based on the pattern for current versions.  Googling XM.v5.5.11 should give you the rest of the filename XM.v5.5.11.xxxxx.yyyyyy.zzzz.img, where xxxxx looks like a revision number, yyyyyy is the year-month-day, and zzzz is the hour-minute of the image.  Applying the same technique, I obtained all version of the binaries going back to 5.5.10 from https://www.ubnt.com/download/airmax-m/
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=205#comment678