Galaxy S21 5G

SM-G991B

Firmware G991BXXU3BUK8

Bulgaria · BGLAndroid 12Built Nov 5, 2021

Release information

Firmware identifiers

The software versions and region covered by this firmware update.

Bulgaria · CSC BGL · 3 carriers in 1 country

What is CSC?

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

A1 BG

MCCMNC28401NWIDNW01657

A1 Bulgaria

5G 3500LTE 900LTE 1800LTE 2100UMTS 900UMTS 2100GSM 900

Vivacom

MCCMNC28403NWIDNW01448

BTC

5G 18005G 3500LTE 900LTE 1800LTE 2100UMTS 900UMTS 2100GSM 900

Yettel

MCCMNC28405NWIDNW01260

Yettel Bulgaria

5G 26005G 3500LTE 1800LTE 2100UMTS 900UMTS 2100GSM 900