The Asus Zenfone 2 ZE551ML is a 2015 Android 5.0 smartphone powered by the Intel Atom Z3580 (4 GB RAM model) Intel Atom Z3560 (2 GB RAM model) with 2GB | 4GB and 128GB | 16GB | 32GB | 64GB internal storage. It features a 5.5", IPS LCD, 1080.0x1920.0 display and is available in Osmium Black, Sheer Gold, Glacier Gray, Glamor Red, Ceramic White.

The Zenfone 2 ZE551ML is equipped with a Li-Po 3000 mAh, non-removable, a 13 MP, 1080p@30fps main camera, a 5 MP front camera. The device uses a Dual SIM (Micro-SIM, dual stand-by) configuration. It weighs 170 g.

A bootloop on the Asus Zenfone 2 ZE551ML 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.