I have the exact same problem with my new GL-MT300A.
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Reset button does absolutely nothing, holding it for 3 seconds or 10 seconds ( according to the manual) , nada…
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It doesn’t provide an IP address over DHCP on the LAN port
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It doesn’t broadcast anything on WiFi.
Completely dead, except it does pass-through WAN-LAN, but that doesn’t help me much.
Since factory reset doesn’t work, how do I a firmware flash/update when I don’t have access to it?
Can it be done with a USB stick?