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The TP-Link Archer VR1200v (v2) is a low end DSL modem based on the EcoNet EN751221 processor platform. While it does have an unlocked bootloader, the factory upgrade feature requires a cryptographic signature so flashing from the web UI is not feasible. The Archer VR1200v (v2) uses a dual-image layout. I have chosen to reuse this to support dual-boot between OpenWRT and the factory firmware. Flashing instructions (from bootloader): Build and then locate the squashfs-sysupgrade.bin image file Get the length of that file in hex: printf '%X\n' "$(stat -c%s the-file-squashfs-sysupgrade.bin)" Connect to device with xmodem capability, e.g. picocom --send-cmd lsx -vv -b 115200 /dev/ttyUSB0 Switch device on and press a key within 3 seconds, you should get to a `bldr>` prompt Type: xmdm 80020000 <file length hex> Quickly start xmodem and send the file, in picocom that is ctrl+a ctrl+s <paste-the-file-name> enter If the transfer fails to start, wait 30 seconds to a minute for the bootloader prompt to return and then try the command again. Once the transfer has completed successfully, type the following flash 80000 80020000 <file length hex> Type `re` or simply restart the device to boot into OpenWRT Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr> Link: https://github.com/openwrt/openwrt/pull/19021 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>