Wavlink WL-WN575A3 - led keeps blinking

Hi all,

I purchased an old Wavlink WL-WN575A3 to use as AP.

I followed the TFTP procedure described here https://openwrt.org/toh/wavlink/wl-wn575a3 but after reboot, when a cable is connected to one of the two ethernet port of the device, the related led to the port keeps blinking very fast.

I uploaded the OEM firmware, and the device came back to live (but with the OEM firmware).

I followed the procedure described here https://mcmillan.website/rewriting-mt7628an-bootloader/
with the support and the files provided by this page https://www.zjtan.net/2021/12/flashing-of-openwrt-onto-a-wavlink-wl-wn575a3-repeater then I followed again the TFTP procedure (with an OpenWRT firmware) but same issue, after reboot of the device, the led keeps blinking very fast.

If I upload the OEM firmware, no problem.

So I assume that tftp procedure works but something is wrong with the Openwrt image.

Any idea please ?