Often considered the most stable "debloated" choice. Unofficial builds for Android 12.1 and 13 are common. DelightOS:
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While official support ended years ago, the developer community remains active with unofficial ports and Generic System Images (GSIs): e/OS community LineageOS (19.1/20/21): Often considered the most stable "debloated" choice
Projects like ProjectMedusaOS port One UI 2 (Android 10) features to the device for users who prefer the Samsung look over stock Android. While official support ended years ago, the developer
The Samsung Galaxy J4 Plus has a surprisingly robust custom ROM scene for a budget device. For users experiencing lag on the stock Android 8.1/9.0 firmware, flashing a lightweight AOSP-based ROM (like LineageOS 18.1
: Currently considered the "hottest" and most advanced option. Reviewers from Reddit note it is surprisingly fast and allows features like Galaxy AI and Android 15 on this budget hardware.
: Users on Telegram community groups warn that higher "U" versions of the bootloader (U6 or higher) have seen increased temperatures and long boot times. Some developers suggest that Samsung may have intentionally throttled newer firmware, making custom ROMs feel "hotter" as they push the hardware.