Galaxy S21 5G

SM-G991N

Firmware G991NKSS4EWK2

South Korea · KOOAndroid 13Built Nov 10, 2023

Release information

Firmware identifiers

The software versions and region covered by this firmware update.

South Korea · CSC KOO · 3 carriers in 1 country

What is CSC?

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

LG U+

MCCMNC45006NWIDNW00680

LG Uplus

5G 3500LTE 850LTE 2100LTE 2600

LG U+

MCCMNC45006NWIDNW00681

LG Uplus

5G 3500LTE 850LTE 2100LTE 2600

olleh

MCCMNC45008NWIDNW00649

LTE 900LTE 1800LTE 2100UMTS 2100

olleh

MCCMNC45008NWIDNW00650

LTE 900LTE 1800LTE 2100UMTS 2100

SKTelecom

MCCMNC45005NWIDNW01125

SK Telecom

5G 3500LTE 850LTE 1800LTE 2100LTE 2600UMTS 2100

SKTelecom

MCCMNC45005NWIDNW01126

SK Telecom

5G 3500LTE 850LTE 1800LTE 2100LTE 2600UMTS 2100