The BLU Advance 4.0 M is a 2016 Android 6.0 smartphone with 512MB and 4GB internal storage. It features a 4.0", TFT, 480.0x800.0 display and is available in Black, White/Blue.

The Advance 4.0 M is equipped with a Li-Po 1300 mAh, removable, a 2 MP, 720@30fps main camera. The device uses a Dual SIM (Micro-SIM, dual stand-by) configuration. It weighs 114 g.

A bootloop on the BLU Advance 4.0 M occurs when the device repeatedly restarts without fully loading Android. This is commonly caused by a failed software update, corrupted system files, or an incompatible app. Most bootloops can be resolved without losing data by clearing the cache partition first before attempting a factory reset.

Factory reset may be needed as a last resort — erases all data.