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Once you are running your new ROM, optimize it:
Before you dive in, ensure you have the following:
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. samsung s9 plus exynos custom rom
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.
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. Once you are running your new ROM, optimize it:
With tools like Franco Kernel Manager or built-in ROM governors, you can undervolt or underclock the Exynos 9810—notorious for its power hunger—to squeeze out an extra hour or two of screen time.
Once you are running a custom ROM, do the following: Before you dive in, ensure you have the following:
Samsung’s One UI is feature-rich but heavy. Custom AOSP (Android Open Source Project) ROMs strip away the bloat. The result? Your S9 Plus becomes snappier, boots faster, and manages RAM better than it did on day one.
