Galaxy S21 5G

SM-G991B

Release G991BXXSIHYK1

Romania · COAAndroid 15Built 11/5/2025

Release information

Firmware identifiers

The software versions and region covered by this firmware update.

Romania · CSC COA · 2 carriers in 1 country

What is CSC?

CSC is Samsung's region and carrier customization. The networks below are included in this release.

Telekom

MCCMNC22603NWIDNW00347

Telekom Romania Mobile

5G 2100LTE 800LTE 900LTE 1800LTE 2100GSM 900GSM 1800

Telekom

MCCMNC22606NWIDNW00347

Telekom Romania Mobile

UMTS 900UMTS 2100