Factory install on ZyXEL NBG6716 fails

I am trying to install v17.01.4 factory.bin image [1] on my ZyXEL NBG6716 box running latest(?) stock firmware V1.00(AAKG.11)C0 via the user interface (firmware upgrade / upload image) but it fails with error message:

"Wrong Project Name Wrong firmware image header!"

I have also copied the image to the router and tested it with the same tool as the upgrade page will end up using, file is good but not accepted:

% md5sum lede-17.01.4-ar71xx-nand-nbg6716-squashfs-factory.bin 
c4662339f5a4a870d78b701b4226aab6  lede-17.01.4-ar71xx-nand-nbg6716-squashfs-factory.bin
% scp lede-17.01.4-ar71xx-nand-nbg6716-squashfs-factory.bin root@192.168.1.1:/tmp/rootfs

root@NBG6716:/tmp# md5sum rootfs 
c4662339f5a4a870d78b701b4226aab6  rootfs
root@NBG6716:/tmp# fw_upgrade fw_check
Wrong Project Name
Wrong firmware image header!

OpenWRT page [2] suggest flashing the factory image to mtd7 but that fw_upgrade would try rip the image into two parts (no idea how) and flash them as:

flash_eraseall /dev/mtd6 > /tmp/fwup_log
nandwrite -mp /dev/mtd6 /tmp/fw_header >> /tmp/fwup_log
flash_eraseall /dev/mtd7 >> /tmp/fwup_log
nandwrite -mp /dev/mtd7 /tmp/fw_img >> /tmp/fwup_log

where mtd6 is header and mtd7 is rootfs in the system.

Any advice how to proceed?

[1] https://downloads.lede-project.org/releases/17.01.4/targets/ar71xx/nand/lede-17.01.4-ar71xx-nand-nbg6716-squashfs-factory.bin

[2] https://wiki.openwrt.org/toh/zyxel/zyxel_nbg6716

Hey There
I know it's been a while this thread was opened but I'm stuck at the same problem although I have a newer Firmware V1.00(AAKG.12).

Does anybody have a solution?

I used "Upgrade from ZyXEL customized OpenWrt" chapter from link [2]. Just change link to newest LEDE

Always up-to-date firmware download links:
https://openwrt.org/toh/views/toh_fwdownload?dataflt[Model*~]=6716

Yay true! Starting the upgrade via telnet like in chapter 2 worked. Thank you!
Well I could have read that chapter my own, but sometimes I just have tomatoes on my eyes :wink:

Hi, I am having the same issue, and more, I don't know how to log into the command line mode of the router. Could anyone helps me here? Thanks in advance.