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Samsung Samsung Galaxy S21 Ultra 5G (SM-G998U)

Stock Firmware • One UI • Android Support

Build / PDA Region (CSC) Rating Android Date Download Link
G998USQSJHZAA VZW ★★★★☆ 9.3/10
v15
 2026-02-02
G998USQSJHZAA ATT ★★★★☆ 9.1/10
v15
 2026-02-02
G998USQSJHZAA CCT ★★★★☆ 9.1/10
v15
 2026-01-29
G998USQSJHZAA CHA ★★★★☆ 9.1/10
v15
 2026-01-29
G998USQSJHZAA TMB ★★★★☆ 9/10
v15
 2026-01-28
G998USQSJHZAA SPR ★★★★☆ 9.1/10
v15
 2026-01-28
G998USQSJHZAA USC ★★★★☆ 9.2/10
v15
 2026-01-28
G998USQSIHYL1 VZW ★★★★☆ 8.9/10
v15
 2025-12-22
G998USQSIHYL1 CHA ★★★★☆ 9.1/10
v15
 2025-12-19
G998USQSIHYL1 CCT ★★★★☆ 9.2/10
v15
 2025-12-19
G998USQSIHYL1 ATT ★★★★☆ 9.2/10
v15
 2025-12-18
G998USQSIHYL1 USC ★★★★☆ 9.2/10
v15
 2025-12-17
G998USQSIHYL1 SPR ★★★★☆ 8.7/10
v15
 2025-12-17
G998USQSIHYL1 TMB ★★★★☆ 8.9/10
v15
 2025-12-17
G998USQSHHYI1 VZW ★★★★☆ 9.2/10
v15
 2025-09-30
G998USQSHHYI1 CHA ★★★★☆ 9.3/10
v15
 2025-09-26
G998USQSHHYI1 CCT ★★★★☆ 9.1/10
v15
 2025-09-26
G998USQSHHYI1 SPR ★★★★☆ 8.8/10
v15
 2025-09-25
G998USQSHHYI1 TMB ★★★★☆ 9.2/10
v15
 2025-09-25
G998USQSHHYI1 ATT ★★★★☆ 8.7/10
v15
 2025-09-25

Samsung Galaxy S21 Ultra 5G (SM-G998U)

Expert technical documentation for the SM-G998U firmware repository. This platform provides professional-grade access to official system files for the Samsung Galaxy S21 Ultra 5G (US Model).

  • 🚀 Direct Sourcing: All firmware packages are retrieved via official Samsung KIES/SmartSwitch protocols, ensuring 1:1 data integrity.
  • 🚀 Untouched Binaries: We provide 100% original, unmodified files with MD5 checksum verification for secure deployment.
  • 🚀 High-Speed Infrastructure: Benefit from dedicated server bandwidth, eliminating the throttling typically found in third-party archives.

⚠️ Technical Safety & Installation Protocol:
Before proceeding with any flash operation on your SM-G998U, it is critical to verify your current Binary Bit (SW REV). Samsung security prevents downgrading to a lower binary version; attempting to flash an incompatible bootloader will result in a device brick. Always utilize a certified Odin version (v3.14.1 or higher) and ensure your battery charge is above 60% to prevent power failure during the critical writing phase.

Professional Recommendation: Prioritize hardware longevity by utilizing verified official repositories. Avoid unofficial mirrors that may compromise device security. Download your SM-G998U firmware here for a guaranteed stable and secure installation.

Step-by-Step Flashing Instruction

To restore or update your SM-G998U, 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 Ultra 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

G998USQSHHYI1
★★★★☆ 9.2/10

VZW • Android 15 • 2025-09-30 • 737 downloads

G998USQSHHYI1
★★★★☆ 9.2/10

TMB • Android 15 • 2025-09-25 • 697 downloads