Samsung S9 Plus Exynos Custom Rom [top] [ 2026 Update ]

Here’s a grammatically proper version of your phrase, depending on how you intend to use it:

As a search term or title:

“Samsung S9 Plus Exynos Custom ROM”

As a full sentence:

“A custom ROM for the Samsung S9 Plus (Exynos version).”

If asking a question:

“What is the best custom ROM for the Samsung Galaxy S9 Plus with Exynos?” samsung s9 plus exynos custom rom

Key corrections made:

Capitalized Samsung and Exynos (proper nouns).
Added Galaxy if referring to the full product name (optional but standard).
Used “the Samsung S9 Plus” in sentence form.
Added “version” or “model” after Exynos for clarity.

Step 4: Flash VBMeta & ROM

Transfer your ROM zip, VBMeta disabler, and GApps to an SD Card (or use ADB Sideload).
In TWRP: Install > Select VBMeta disabler > Swipe.
Install > Select ROM Zip > Swipe.
(If needed) Install > Select GApps.
Optional: Install Magisk (for root) at this stage.

Part 5: Post-Installation Tweaks for the Exynos 9810

Once you are running your new ROM, optimize it:

Install ZGCam (Google Camera): Look for "ZGCam S9 Exynos 8.4" on XDA. This mitigates camera quality loss.
Disable ZRAM: The Exynos 9810 benefits from disabling virtual RAM. Use a kernel manager (like SmartPack) and set swappiness to 0.
HKTweaks: A must-have app for Exynos S9 users. Reduce the big core frequency from 2.7GHz to 2.2GHz to prevent thermal throttling.
Enable Force 4x MSAA: In Developer Options, this smooths out UI animations significantly.

Step-by-Step Installation Guide

Warning: Flashing a custom ROM requires basic technical skill. Follow order strictly. Here’s a grammatically proper version of your phrase,

3. ArrowOS

Base: AOSP

4. Battery Longevity

Via tools like HkTweaks or Radioactive Kernel, custom ROMs allow undervolting and underclocking. You can squeeze out another year of battery life by tuning the Exynos 9810 to run cooler.

5. One UI 4.1 Ports (Android 12) – The Nostalgia Option

Noble ROM and Elite UI are unofficial ports that bring One UI 4.1 to the S9.
Verdict: Avoid for performance. They are buggy (camera issues, overheating). Stick to AOSP-based ROMs for the S9 Plus Exynos in 2024.

Troubleshooting Common Issues

Issue: Phone boot loops or stays at Samsung logo. Fix: You forgot to format data (not just wipe). Go back to TWRP, Format Data, and re-flash.

Issue: IMEI is unknown / No SIM card detected. Fix: You flashed a ROM for the wrong variant. Ensure it says star2lte (Plus) not starlte (S9). Restore your EFS backup if you made one. “Samsung S9 Plus Exynos Custom ROM”

Issue: SafetyNet / Play Integrity fails (Netflix not in Play Store). Fix: Install Play Integrity Fix Magisk module and clear Play Store data. Use Shamiko to hide root.