The ZTE V821 is a 2011 Android 2.2 smartphone powered by the Mediatek MT6516 and 256MB internal storage. It features a TFT resistive touchscreen, 65K colors, 320.0x240.0 display and is available in Black.

The V821 is equipped with a Removable Li-Ion battery, a 2 MP, Yes main camera. The device uses a Dual SIM (Mini-SIM) configuration. It weighs 120 g.

A bootloop on the ZTE V821 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.