Due to recent changes in Mikrotik's software, the first install procedure for AREDN code has been updated. This should help reduce some of the difficulties folks have been having with newly-purchased Mikrotik gear.
You can find the revised procedure here: https://docs.arednmesh.org/en/latest/arednGettingStarted/installing_firmware.html#mikrotik-first-install-process
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Orv W6BI