Build Number: N900AUCUEOC1/N900AATTEOC1/N900AUCUEOC1
100% Stock Non-Rooted Procedure
1. Make sure you are on 100% stock non-rooted NL1 currently (ie no ROOT, NO BUSYBOX, NO Xposed etc.)
2. If you are not sure then restore to complete stock using this NL1 files. : Here
3. Now download the following file and save it on the external SD card: Here
4. Reboot into recovery by pressing Volume UP + Power + Home
5. Once in recovery select "apply update from external sd"
6. Then select the above file you downloaded called "N900A_OC1_Stock(100%).zip"
7. Enjoy 100% Stock Lollipop 5.0 (OC1).
8. If you change your mind and want root... then you can! (Just follow the procedure below).
100% Stock Rooted Procedure
1. Restore back to complete NC2 stock using this files: Here or Here
2. Root using Towelroot: Here
3. Install busybox: Here
4. Install SS: Here
5. Download the following file and save it on your external SD: Here
5. Now follow steps 1 to 5 from this thread: Here
6. Once that is done go back to flash the above file you downloaded called "N900A_OC1_Stock_Rooted.zip" using Safestrap.
7. Last, from the main menu press "Reboot," reboot into "Download" mode and flash the following files using Odin's AP slot: Here
Download/Odin Mode Flash Counter after OC1 update: S2, T2, R2, A3, P2.....
GOOD NEWS..... Downgrade to NL1/NC2 still possible!!!!!
100% Stock Non-Rooted Procedure
1. Make sure you are on 100% stock non-rooted NL1 currently (ie no ROOT, NO BUSYBOX, NO Xposed etc.)
2. If you are not sure then restore to complete stock using this NL1 files. : Here
3. Now download the following file and save it on the external SD card: Here
4. Reboot into recovery by pressing Volume UP + Power + Home
5. Once in recovery select "apply update from external sd"
6. Then select the above file you downloaded called "N900A_OC1_Stock(100%).zip"
7. Enjoy 100% Stock Lollipop 5.0 (OC1).
8. If you change your mind and want root... then you can! (Just follow the procedure below).
100% Stock Rooted Procedure
1. Restore back to complete NC2 stock using this files: Here or Here
2. Root using Towelroot: Here
3. Install busybox: Here
4. Install SS: Here
5. Download the following file and save it on your external SD: Here
5. Now follow steps 1 to 5 from this thread: Here
6. Once that is done go back to flash the above file you downloaded called "N900A_OC1_Stock_Rooted.zip" using Safestrap.
7. Last, from the main menu press "Reboot," reboot into "Download" mode and flash the following files using Odin's AP slot: Here
Download/Odin Mode Flash Counter after OC1 update: S2, T2, R2, A3, P2.....
GOOD NEWS..... Downgrade to NL1/NC2 still possible!!!!!
xda-developers