Here is the complete story of the Custom ROM scene for the Samsung Galaxy A9 (2018), a device remembered as a technological pioneer that unfortunately became a developer's orphan.

Scorecard (LineageOS 20 as benchmark):

Step 3: Boot into Recovery Mode

Passing SafetyNet (Banking Apps & Netflix)

1. Install Magisk (rename the .apk to .zip and flash in TWRP).
2. Install MagiskHide Props Config module.
3. Force a basic fingerprint (choose Pixel 6 fingerprint).
4. Enable Zygisk and enforce DenyList for Google Play Services and your banking apps.

Rating: 4.5/5

If you are a user who relies on Samsung Pay, Secure Folder, or needs a perfect point-and-shoot camera, stick with the stock Android 10 ROM. It’s old but stable.

Technical Report: Custom ROM Development for Samsung Galaxy A9 (2018)

Report ID: AND-CROM-SMA9-2024
Date: [Current Date]
Device Codename: a9y18qlte
SoC: Qualcomm Snapdragon 660 (SDM660)

This is where custom ROMs come in. Installing a custom ROM on your Samsung A9 2018 can transform it from a forgotten mid-ranger into a modern, feature-packed device running Android 13 or even Android 14. This guide will walk you through everything you need to know—from unlocking the bootloader to the best available ROMs.