Originally Posted by sunnyboymark
I'm on a Stock Rooted with Custom Recovery. how Can I update the firmware?
You need to download and Odin flash the official stock N900T NE6 firmware.
Here is the direct fast download link for it:
The zip file also contains Odin, CF-Autoroot and TWRP 220.127.116.11 recovery.
Unzip the file into a new folder in windows desktop.
Be sure to go into recovery before Odin flashing NE6 and do a factory data reset
and a full wipe. Then Odin flash the TAR/MD5 firmware.
After successful odin flash, put the phone into download mode again and
flash cf-autoroot and the TWRP 18.104.22.168 tar files.
If you want more information and or instructions here is the link: