hello, i 'm not sure the right version of ath79 target for the powerbeam 400 m2, i don't want brick it.
in the ar71xx target the version for this devise is: ubnt-loco-m-xw-squashfs-sysupgrade.bin.
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I tried flashing OpenWRT 23 but and it's working on powerbeam 400 m2 but with format configuration everytime i shutdown the device
Use 22.03.5. There is a bug in 23 that prevents writing to flash in some ath79 Ubiquiti.
To downgrade you'll need to TFTP back to stock then install OpenWrt again.