Is there support for Ubiquiti Flex HD planned or already available? I couldn't find more information about this device yet.
It is the same platform as the Nano HD, which has a snapshot build.
https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=4c8446bf39de99990847eb4bc7744e25835a34f5
I'm not saying that it will work to flash the Nano HD firmware to it, but it seems likely that it would.
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So I tried to flash openwrt-21.02.0-rc2-ramips-mt7621-ubnt_unifi-nanohd-squashfs-sysupgrade.bin to the Flex HD as instructed on the commit message, although the ubnt firmware on the device was 5.43.23 (As per https://www.ui.com/download/unifi/unifi-flex-hd, the oldest officially available firmware is 4.0.54 and not 3.9.27). This most likely broke the device, as the LED is now flashing white-blue-off and isn't reachable (the reset button doesn't help). There seems to be some work to do to get the Flex HD supported by OpenWrt as it seems.
Now I have to figure out how to unbrick my Flex HD again 
Just figured out that White-Blue-Off means tftp mode. I was able to restore the original firmware with atftp --trace --option "timeout 1" --option "mode octet" --put --local-file BZ.mt7621.v4.0.54.10625.190801.0944.bin 192.168.1.20. So I would be able to give it another try once there is support for this device in OpenWrt.