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Samsung Samsung Galaxy S21 5G (SM-G991U)

Stock Firmware • One UI • Android Support

Build / PDA Region (CSC) Rating Android Date Download Link
G991USQSJHZAA VZW ★★★★☆ 9/10
v15
 2026-02-02
G991USQSJHZAA ATT ★★★★☆ 9.2/10
v15
 2026-02-02
G991USQSJHZAA CHA ★★★★☆ 9.4/10
v15
 2026-01-29
G991USQSJHZAA CCT ★★★★☆ 9.3/10
v15
 2026-01-29
G991USQSJHZAA USC ★★★★☆ 8.9/10
v15
 2026-01-28
G991USQSJHZAA DSH ★★★★☆ 9.3/10
v15
 2026-01-28
G991USQSJHZAA DSA ★★★★☆ 8.8/10
v15
 2026-01-28
G991USQSJHZAA TMB ★★★★☆ 9.2/10
v15
 2026-01-28
G991USQSJHZAA SPR ★★★★☆ 9.2/10
v15
 2026-01-28
G991USQSIHYL1 VZW ★★★★☆ 9.2/10
v15
 2025-12-22
G991USQSIHYL1 CHA ★★★★☆ 8.7/10
v15
 2025-12-19
G991USQSIHYL1 CCT ★★★★☆ 9.3/10
v15
 2025-12-19
G991USQSIHYL1 ATT ★★★★☆ 9.2/10
v15
 2025-12-18
G991USQSIHYL1 USC ★★★★☆ 9.3/10
v15
 2025-12-17
G991USQSIHYL1 SPR ★★★★☆ 8.8/10
v15
 2025-12-17
G991USQSIHYL1 TMB ★★★★☆ 9.2/10
v15
 2025-12-17
G991USQSIHYL1 DSH ★★★★☆ 8.7/10
v15
 2025-12-17
G991USQSIHYL1 DSA ★★★★☆ 9.1/10
v15
 2025-12-17
G991USQSHHYI1 VZW ★★★★☆ 8.7/10
v15
 2025-09-30
G991USQSHHYI1 CHA ★★★★☆ 9/10
v15
 2025-09-26

Samsung Galaxy S21 5G (SM-G991U)

Official SM-G991U Firmware Repository
This specialized resource provides high-speed access to genuine Samsung Galaxy S21 5G (SM-G991U) firmware files. Unlike third-party mirrors, our infrastructure utilizes direct links to Samsung KIES/SmartSwitch servers, ensuring you receive 100% untouched, original binary files with verified MD5 checksums.

  • 🚀 Optimized Throughput: Unlimited download speeds for rapid recovery and system updates.
  • 🛡️ Integrity Guaranteed: Official factory images with no modifications, pre-rooted kernels, or injected scripts.
  • 🔄 Real-time Availability: Immediate access to the latest security patches and Android version increments.

⚠️ Technical Safety Protocols:
Before proceeding with installation via Odin3, verify that your current Binary Bit (SW REV.) version matches or is lower than the firmware version you intend to flash. Samsung's bootloader security prevents downgrading to a lower binary level. Ensure your device maintains at least a 60% battery charge to prevent power failure during the partition write process. Always utilize a high-quality, original USB data cable connected to a stable motherboard port.

For critical system restoration or regional transitions, rely exclusively on official firmware. Avoid modified packages from unverified sources that may compromise Knox security or device stability. Prioritize your device's longevity and security by using our trusted, authoritative archive.

Step-by-Step Flashing Instruction

To restore or update your SM-G991U, use the latest Odin flash tool. This process will fix system bugs and bootloops.

  1. Preparation: Download the firmware archive and extract the .tar.md5 files.
  2. Odin: Open Odin3 v3.14.4 (or newer) on your computer.
  3. Download Mode: Power off your Samsung Galaxy S21 5G. Hold Vol Up + Vol Down and plug it into the PC via USB.
  4. Load Files: Select files for each slot: BL, AP, CP, and CSC.
  5. Flash: Click Start. Wait for the green "PASS!" box to appear.
Important: Use HOME_CSC to keep your files and settings. Use CSC for a complete factory reset.

Popular Builds

G991USQSHHYI1
★★★★☆ 8.7/10

VZW • Android 15 • 2025-09-30 • 686 downloads

G991USQSHHYI1
★★★★☆ 9/10

CHA • Android 15 • 2025-09-26 • 681 downloads