Thanks for replying.
Using Uboot flash method I can get to the web page where I can upload the .bin file.
I can upload the file, it seems to do something, but after few minutes, the led keep blinking faster, the router seems not to reboot and openwrt is not installed.
I don’t know what am I missing here. Maybe the wrong file ? am using the following one:
https://downloads.openwrt.org/releases/21.02.2/targets/ipq40xx/generic/openwrt-21.02.2-ipq40xx-generic-glinet_gl-ap1300-squashfs-nand-sysupgrade.bin