The BLU J4 is a 2019 Android 8.1 Oreo smartphone with 1GB and 32GB internal storage. It features a 5.5", IPS LCD, 720.0x1440.0 display and is available in Blue, Black, Brown.

The J4 is equipped with a Li-Po 2200 mAh, removable, a 8 MP, 720p@30fps main camera, a 8 MP, 720p@30fps front camera. The device uses a Nano-SIM + Nano-SIM configuration. It weighs 158 g.

Recovery Mode on the BLU J4 is a special bootable partition that operates independently from the main Android system. It allows you to perform advanced operations including cache wipes, factory resets, and software repairs even when the phone cannot boot normally. Access it carefully as some options will erase all data.

Used for cache wipes, factory resets, and advanced repairs.