git clone https://git.openwrt.org/openwrt/openwrt.git cd openwrt make menuconfig # Target System -> MediaTek/Ralink (or appropriate) # Subtarget -> XXX # Target Profile -> WLWN523N2 make -j4 V=s The resulting bin/targets/.../openwrt-sysupgrade.bin is ready for flashing. Modify the bootloader to support two firmware banks (active and backup):
setenv ipaddr 192.168.1.100 setenv serverip 192.168.1.10 tftp 0x80000000 new_firmware.bin nand erase 0x0 0x800000 # Erase entire flash (caution!) nand write 0x80000000 0x0 0x800000 reset If U-Boot is corrupted, you need JTAG. Connect your programmer to the JTAG header (TCK, TMS, TDI, TDO, TRST). wlwn523n2 firmware work
From the U-Boot prompt:
WLWN523N2 U-Boot 2019.07 (Jan 01 2023 - 10:00:00) Press any key to stop autoboot: 2 => Before writing anything new, back up the current firmware, especially the ART/calibration partition (often mtd2 or art ). Losing this is irreversible and will kill your Wi-Fi performance. git clone https://git