Any tutorial how to flash the MobiPromo CM520-79F?

I've stumbled upon this device:

It is so cheap (~12 USD) for an IPQ4019 SoC, 128MiB ROM and 512MiB RAM. Looking at the table of hardware, I find that it is officially supported by OpenWrt 21.02 (device page).

The only remaining problem is, how to flash this device? Why it is supported by OpenWrt but no documentation is available? Does the guy who submits the code to support it just leave nothing for people to know how to get it working?

Developer's notes and flashing instructions here:
https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=a30abb1b6bb66d1caf08c331805163e6fef6f2a1
This is the "git commit" link on the device page.

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