Home / Firmware / SM-G991U / ATT

Firmware G991USQSHHYI1

Device Galaxy S21 5G

Model SM-G991U

Region ATT

Country USA

OS Android 15

Release Date 9/3/2025

Upload Date 9/25/2025

PDA G991USQSHHYI1

CSC G991UOYNHHYI1

Changelist 30959686

Size 8396627888 bytes (approx. 7.8 GB)

ATT CSC Breakdown

Network ID

NW00156

Network Name

Anritsu

Network Country

Network Bands

any

Network ID

NW00167

Network Name

AT&T Mobility

Network Country

United States of America

Network Bands

GSM 1900

Network ID

NW02038

Network Name

AT&T Mobility

Network Country

United States of America

Network Bands

GSM 850 / GSM 1900 / UMTS 850 / UMTS 1900 / LTE 700 / LTE 850 / LTE 1700 / LTE 1900 / LTE 2300 / 5G 850 / 5G 3700 / 5G 39000

Network ID

NW02036

Network Name

AT&T Mobility

Network Country

United States of America

Network Bands

GSM 850 / GSM 1900 / UMTS 850 / UMTS 1900 / LTE 700 / LTE 850 / LTE 1700 / LTE 1900 / LTE 2300 / 5G 850 / 5G 3700 / 5G 39000

Network ID

NW00168

Network Name

AT&T FirstNet

Network Country

United States of America

Network Bands

LTE 700

Network ID

NW00057

Network Name

AT&T Mobility

Network Country

United States of America

Network Bands

GSM 850 / UMTS 850 / UMTS 1900

Network ID

NW02171

Network Name

AT&T Mobility

Network Country

United States of America

Network Bands

GSM 850 / GSM 1900 / UMTS 850 / UMTS 1900 / LTE 700 / LTE 850 / LTE 1700 / LTE 1900 / LTE 2300 / 5G 850 / 5G 3700 / 5G 39000

Network ID

NW02172

Network Name

AT&T Mobility

Network Country

United States of America

Network Bands

GSM 850 / GSM 1900 / UMTS 850 / UMTS 1900 / LTE 700 / LTE 850 / LTE 1700 / LTE 1900 / LTE 2300 / 5G 850 / 5G 3700 / 5G 39000