The vivo X300 Ultra is a 2026 Android 16, OriginOS 6 smartphone powered by the Qualcomm SM8850-AC Snapdragon 8 Elite Gen 5 (3 nm) with 12GB | 16GB and 1TB | 256GB | 512GB internal storage. It features a 6.8", LTPO AMOLED, 1B colors, 144Hz, 2160Hz PWM, Dolby Vision, HDR10+, HDR Vivid, 1440.0x3168.0 display and is available in Eclipse Black, Victory Green, Silver.

The X300 Ultra is equipped with a Si/C Li-Ion 6600 mAh (International) or 6400 mAh (Europe), a 200 MP, 8K@30fps, 4K@24/30/60/120fps (10-bit Log, Dolby Vision HDR), 1080p@30/60/120/240fps, gyro-EIS, HDR10+ main camera, a 50 MP, 4K@30/60fps, 1080p@30/60fps, gyro-EIS, HDR front camera. The device uses a · Nano-SIM + Nano-SIM + eSIM (max 2 at a time) · Nano-SIM + Nano-SIM configuration. It weighs 232 g.

A bootloop on the vivo X300 Ultra 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.