The Celkon Q405 is a 2015 Android 4.4 smartphone powered by the Spreadtrum 7731 with 512MB and 4GB internal storage. It features a 4.0", TFT, 256K colors, 480.0x800.0 display and is available in Black, White, Gold, Blue.

The Q405 is equipped with a Li-Ion 1500 mAh battery, a 15 MP, Yes main camera, a 3 MP front camera. The device uses a Dual SIM configuration. It weighs 137 g.

A bootloop on the Celkon Q405 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.