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It works because you still flashed one, and by removing the USB stick it will fail to boot mtdblock2 (which has untangle) so it just keeps rebooting.
The linksys will switch partitions on failure to boot, so eventually it will block mtdblock4 which has linksys.
Understand, so what we should do to have it done properly? I am bot able to edit the post with the procedure and remove the rm command from it.
just run the two commands i gave.
no need for the rm - it does nothing.
1. get the firmware file into the device(linksys wrt 1900ac)
A. renamed file FOOBAR couldn't change extension FOOBAR.img is the new file
B. i used FileZilla login as root and password port 22(unless you changed SSh port)
C. i file placed in root folder
2. Make sure SSH is enabled
3. ssh into untangle as root
4. run dd commands
A. dd if=FOOBAR.img of=/dev/mtdblock2 bs=1M
B. dd if=FOOBAR.img of=/dev/mtdblock4 bs=1M
5. remove USB with untangle image
6. Power off device
7. i waited 10 min before powering up device
8. SUCCESS!! bank into linksys
so it is confirmed, rm command should NOT be used !took less than half-hour i do use linux regularly