Samsung uses a proprietary VoLTE implementation. On non-One UI ROMs (like LineageOS or AOSP GSIs), VoLTE rarely works. Regular 3G/2G voice calls and 4G data will work perfectly.
Flashing wipes your internal storage completely. Back up contacts, photos, and documents to a PC or cloud storage.
Custom ROMs strip away heavy Samsung Knox security layers and background telemetry, freeing up CPU cycles and RAM. j400f custom rom
If you want the look and feel of a Google Pixel on a budget Samsung device, ports of Pixel Experience are floating around XDA forums. These are excellent for users who want a cleaner aesthetic without the granular tweaking of LineageOS. However, because these are often maintained by smaller teams or individual developers, bugs (such as VoLTE issues or broken video recording) are more common than in the major Lineage releases.
A custom recovery, specifically , is a tool that allows you to flash custom ROMs, kernels, and other modifications. It replaces the stock Samsung recovery. Samsung uses a proprietary VoLTE implementation
Boot into : Press and hold Volume Down + Volume Up buttons simultaneously, then connect the phone to your PC via USB cable. Release when a blue warning screen appears, then press Volume Up to continue.
It focuses on efficiency, making it ideal for the 1GB RAM on the J4 Core. 2. LineageOS with GApps (Light) Flashing wipes your internal storage completely
Flashing a custom ROM carries risks, including bricking your device. Ensure you complete these steps before starting: