The Doogee S40 Pro is a 2020 Android 10 smartphone powered by the Mediatek MT6762 Helio A25 (12 nm) with 4GB and 64GB internal storage. It features a 5.5", IPS LCD, 720.0x1440.0 display and is available in Black, Orange, Green.

The S40 Pro is equipped with a 4650 mAh, a 13 MP, 1080p main camera, a 5 MP front camera. The device uses a Nano-SIM + Nano-SIM configuration. It weighs 238 g.

A bootloop on the Doogee S40 Pro 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.