Use default IP addresses and enter the file name accordingly, then hit enter.
Power on the device and keeps pressing 1 until you see the prompt.
Connect any LAN port to your PC and configure a static IPv4 address: 192.168.0.101 (netmask 255.255.255.0) for your interface.
Setup a TFTP server on your PC that can serve xxx-ramips-mt7621-dlink_dir-853-a1-initramfs-kernel.bin.
Open a terminal emulator on your PC using 57600 baud, 8 data bits, no parity bit, one stop bit, and no flow control.
Connect it to a USB-UART TTL adapter, no need to connect VCC.
Open the case, and solder the 4-pin header near the WAN port.
Mac addresses of the 2.4g and 5g interface are stored as ASCII strings in the u-boot-env partition. The OpenWrt image must have 96 bytes of padding in the header.
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