Flash instructions:
1. Connect to the router using ssh or telnet,
username: useradmin, password is the web
login password of the router.
2. Use scp to upload bl31-uboot.fip and flash:
"mtd write xxx-preloader.bin spi0.0"
"mtd write xxx-bl31-uboot.fip FIP"
"mtd erase ubi"
3. Connect to the router via the Lan port,
set a static ip of your PC.
(ip 192.168.1.254, gateway 192.168.1.1)
4. Download initramfs image, reboot router,
waiting for tftp recovery to complete.
5. After openwrt boots up, perform sysupgrade.
Note:
1. Back up all mtd partitions before flashing.