Here are some popular custom ROMs available for the Galaxy J4 Plus:
crDroid offers insane customization (status bar mods, lock screen clocks, gestures). It is maintained by a dedicated developer who updates monthly. samsung galaxy j4 plus custom rom hot
Some devs have managed to get GPU overclocking (via custom kernels) and swap RAM zRAM tweaks that let you keep 5–6 apps in memory. On 2GB of RAM in 2025. Yes. Here are some popular custom ROMs available for