The Samsung Galaxy S21 5G is a 2021 Android 11, up to 4 major Android upgrades, One UI 7 smartphone powered by the Exynos 2100 (5 nm) - International Qualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China with 6GB | 8GB and 128GB | 256GB internal storage. It features a 6.2", Dynamic AMOLED 2X, 120Hz, HDR10+, 1300 nits (peak), 1080.0x2400.0 display and is available in Phantom Gray, Phantom White, Phantom Violet, Phantom Pink.

The Galaxy S21 5G is equipped with a Li-Ion 4000 mAh, a 12 MP, 8K@24fps, 4K@30/60fps, 1080p@30/60/120/240fps, HDR10+, stereo sound rec., gyro-EIS main camera, a 10 MP, 4K@30/60fps, 1080p@30fps front camera. The device uses a · Nano-SIM + eSIM · Nano-SIM + Nano-SIM + eSIM (max 2 at a time) configuration. It weighs 169 g.

A bootloop on the Samsung Galaxy S21 5G 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.