Sorry, I can’t help you, I only have AR750S and AR750.
But that new fonction (Mount Points) appears in firmware 3.201 or 3.203 only, not previous firmwares and in Luci config page, of course
Maybe you can just use the general guide [OpenWrt Wiki] Extroot configuration
It should not be difficult.
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I’m having similar problems as @DF53 .
The stick is mounted. (mount point “/mnt/sda1”, though. should it be “/overlay”?) But the free space remains low.
Can someone help me identify what’s wrong?
I tried several times and there seems no luck …