UniFi AP AC LR different flash layout

I'm dealing with several units with flash layout which slightly differs from the one in the docs. I got them second hand so can't give you more details. The year printed on the board is 2011 and the antennas are the size of a euro coin each. This thing's ancient. Here's the reported layout:

UBNT-BZ.v4.3.28# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00040000 00010000 "u-boot"
mtd1: 00010000 00010000 "u-boot-env"
mtd2: 00760000 00010000 "kernel"
mtd3: 00040000 00010000 "cfg"
mtd4: 00010000 00010000 "EEPROM"

Should I flash initramfs-kernel.bin image first and then the squashfs-sysupgrade.bin? To be frank, I tried with the sysupgrade first but I think I bricked one of the units.

It turned out the devices are using different SoC than the current ones. The bricked one still accepts TFTP payloads so not really bricked, but unfortunately the SoC is so old that is 8/32 so not really usable.

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