The Celkon A402 is a 2015 Android 4.4.2 smartphone powered by the Spreadtrum 7715 with 512MB and 4GB internal storage. It features a 4.0", TFT, 256K colors, 480.0x800.0 display and is available in White, Black, Blue, Silver.

The A402 is equipped with a Li-Ion 2000 mAh battery, a 15 MP, Yes main camera, a 3 MP front camera. The device uses a Dual SIM configuration. It weighs 104 g.

A bootloop on the Celkon A402 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.