I'm installed TWRP 18.104.22.168 via GooManager and that went smoothly. But when I went to do a nandroid backup, the modem partition isnt there. The other partitions (boot, system, cache, data, efs) are there. In "Mount" the modem partition wasn't mounted so I tried to mount it, but that didn't add it to the available partitions to backup either. Is it normal for the modem partition to be missing? How can I back it up?