Galaxy S21 5G

SM-G991B

Release G991BXXSJHZA6

Ireland · TSIAndroid 15Built 1/21/2026

Release information

Firmware identifiers

The software versions and region covered by this firmware update.

Ireland · CSC TSI · 2 carriers in 2 countries

What is CSC?

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

Tesco MobileMVNO

MCCMNC27211NWIDNW01287

Liffey Telecom

Proximus

MCCMNC20601NWIDNW01287

Proximus SA

5G 21005G 3500LTE 800LTE 1800LTE 2600GSM 900GSM 1800