Firmware Direct Download Pricing News App

© 2015, 2026 Samfrew.com

Disclaimer: Flashing Samsung firmware is a risky process that can potentially brick your device. By flashing firmware, you are modifying the software on your device, and if anything goes wrong, your device may become unusable.

[email protected] Privacy Policy Terms of Service

Samsung Galaxy S21 5G (SM-G991B) Android 15 Firmware (G991BXXSIHYK1) – Greece | SamFrew

Home / Firmware / SM-G991B / COS

Galaxy S21 5G

SM-G991B Firmware

PDAG991BXXSIHYK1

COSAndroid 15Released 11/5/2025

Firmware details

Technical package info

Key identifiers and package metadata for this release.

PDA: G991BXXSIHYK1
CSC: G991BOXMIHYK1
Country: Greece
Changelist: 30959686
Upload date: 12/1/2025
Package size: 8.4 GB (9061365856 bytes)
File name: COS-G991BXXSIHYK1-20251201200710.zip

Download

Choose your download path

Fast download uses your premium allowance. Standard download works without premium bandwidth.

Package size8.4 GB

Checking accessLoading...

COS CSC Breakdown

Network ID

NW00347

Network Name

COSMOTE

Network Country

Greece

Network Bands

GSM 900 / LTE 800 / LTE 1800 / LTE 2600 / 5G 1800 / 5G 2100 / 5G 3500