[Samsung Galaxy S9+ Guides, News, & Discussion] fish312:
[MENTION=3971894]evaworld[/MENTION]
[MENTION=4735532]daviddema[/MENTION]
[MENTION=6770398]Mrferrelli[/MENTION]

I will try to share my experience, I have had the most harrowing time rooting the S9+ over these past few weeks. Let me give you anecdotes on what I found that worked, what does not work, and what I did. Hope it helps.

First, if your phone is a snapdragon variant (e.g. G965U) you are SOL, your bootloader is forever locked and you CANNOT root your phone.

Next, the date time trick DOES NOT WORK anymore on the S9+. I have tried every permutation of it (setting samsung + google accounts + sim card + playing with checking updates) and nothing works. The only reliable way is to wait 7 days. You CANNOT even switch to an older bootloader because the S9+ will trigger the G965FXXU2 e-fuse once you patch it, and you can never use ANY G965FXXU1 bootloaders again. If you are still on U1, you can try flashing the earliest (jan-march 2018) firmwares and trying the date trick, I don't know it that will work as that option does not exist for me anymore.

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For the times that the RMM remained Prenormal I think I always messed up or skipped a step or two. So this is how I finally got it to work. Some steps might be unnecessary but I'll list them all as that is what I did.

Part 1 - Time in RMM Hell

1. Log out of all accounts on the phone, google/samsung accounts, you don't want an FRP lock complicating things on top of everything else.

2. Inserted a local sim card

3. Use SamFirm to download the latest firmware (G965FXXU2CRLN Pie) for your locality.

4. Do a factory reset from the settings menu, don't setup anything, just power off once its done and enter download mode.

5. Use Odin and flash this firmware, flash everything with their respective files (AP, BL, CP and CSC).

6. Connect wifi and perform the full setup, accept all TOS and login using Google and Samsung accounts. DO NOT tamper with the date, leave it automatic.

7. Check for updates. You should see that you are already on the latest firmware.

8. You can enable developer options. OEM Unlock may or may not be there (it doesn't matter at this point, it was already enabled and there for me but that was because I unlocked it earlier in a failed root).

9. Plug in a charger, leave it alone for 7 day (168 hours) uptime while connected to wifi and with a Sim card.

10. At the end of the 7 days, make sure wifi is on and check for updates again. After confirming no updates, leave it alone for a few minutes after that.

11. Now, hopefully the RMM/RLC prenormal flag is gone. You can try enable ADB and check the logcat for "Prenormal" to verify (not 100% sure if its accurate though)

12. In any case, by now OEM unlock should be available in developer settings, and may or may not already be unlocked.

13. Set it to OEM unlock (forces wipe), or if it's already unlocked, restart the phone. Enter immediately into download mode (VolDown+Bixby+Power). Don't boot to system.

14. See if RMM Prenormal is gone. If yes, proceed to Part 2!

15. If RMM Prenormal is still there, there is one thing left to try. Do not clear or flash anything. Restart your phone, developer settings, and DISABLE (yes, DISABLE) OEM unlock. It will force a factory reset, and you should immediately enter download mode again. For some reason, this actually removed RMM Prenormal once for me. If this works, then you can go into settings and reenable OEM unlock, then you should be able to enter download mode with no RMM prenormal and flash TWRP.

If by the time you have reenabled OEM unlock and entered download mode the 3rd time, and it is still RMM Prenormal then bad luck, I can't help further.

Part 2 - Common Pitfalls when breaking out of prison

So you have entered into download mode with no RMM prenormal! Congrats! But you are not yet free, it is very easy to screwup like I did and waste another 7 days. This may come in helpful.

- Remember the golden rule. Once you have reached download mode you must NEVER EVER return back to normal system boot WITHOUT having ketan's G965_PIE_Root_for_OEM_issue_devices_V5 issue fix flashed. If you do, the system will brick, you will lose TWRP and must redo EVERYTHING again 7 days later. It happened to me, it can happen to you.

- Before flashing twrp-3.2.3-0-star2lte.img.tar remember to disable Auto reboot in Odin! Otherwise a bad timed reboot and its back to jail!

- Make sure you have battery charged and a good USB cable. Flash TWRP in the AP slot and wait for PASS.

- Once you get PASS, leave download mode with (Power+VolDown) then IMMEDIATELY press (Power+Bixby+VolUp) when the screen changes. You only get one shot!

- TWRP should start to load. Don't relax yet! My TWRP auto-restarted on me during my first load! If this ever happens you must IMMEDIATELY use the force shutdown ASAP to kill power (Power+VolDown hold).

- Make sure you unlock read only then do a format as in ketan's instructions! Some other videos say to keep read only but don't.

- After formatting, you should reboot into twrp again. If you find yourself unsure or booting into system, immediately kill power as above.

- Once you've successfully installed the issue fix zip you can finally relax. Make sure to use OEM patch as ketan says.

Check my post history for more info on what I did.