Custom Rom ((hot)) — J400f

Copy the downloaded ROM zip file (e.g., LineageOS) and GApps (if needed) to your SD card. Select in recovery. Select the ROM zip file and swipe to confirm flash.

If your chosen ROM does not include Google Play services, download an ARM32/ARM64 compatible GApps package (typically Android 10 or 11, matching your ROM version). Step-by-Step J400F Custom ROM Installation Guide Step 1: Flash TWRP Recovery via Odin Power off your phone completely. j400f custom rom