I install OpenWrt on my ZyXEL NR7101 and when i login to Http://192.168.1.1 it says : System running in recovery (initramfs) mode.
feel uncomfortable with it would you please guide me how to install the original OS on my ZyXEL NR7101
@ Tarmgass especial thank for your supporting me on my zyxel nr7101
I would like to inform you that I finally install OEM firmware on my device without your help i couldn't do it
AFAIK, the OEM firmware does not use this variable.
The real serial number is found in the "Factory" partition along with the device specific certificate and presumable other device speciifc settings. You can read it out with strings or hexdump or similar. E.g on OpenWrt (slightly obfuscated):
root@OpenWrt:/# strings /dev/mtd2 | head -4
strings: standard output: Broken pipe
This partition should never be touched. I still recommend making a backup just in case. But the backup is not required unless you do something spectacularly wrong.
Installing OpenWrt or reverting to stock, using the intructions provided here, will not destroy any data in the Factory partition.
Note that the certificate and matching private key are required if you ever want to enroll the device with operator management again. It is unique for each device and signed by Telenor.