Samsung Galaxy A20 (SM-A205S) - SKC - A205SKSU4BTF2 firmware
Samsung Galaxy A20 firmware A205SKSU4BTF2 is the Android 10 build for the Samsung Galaxy A20 (model SM-A205S), released by Samsung for Korea (SK Telecom) (SKC). It was built on 12 June 2020, carries the 2020-06-01 Android security patch, has changelist 18930475. The package combines system build A205SKSU4BTF2 (AP/PDA) with CSC build A205SSKC4BTF2 for the SKC region code. SamMobile added this file to the firmware archive on 6 July 2020.
How to flash A205SKSU4BTF2 on the Samsung Galaxy A20 (SM-A205S)
We recommend updating through Samsung's own tools: over-the-air (Settings › Software update) or Samsung Smart Switch on a PC. Flash the full firmware with Odin only when you are sure about the risks. A wrong region or a failed flash can brick the device, and SamMobile is not responsible for any damage.
- Download the firmware package above and extract the ZIP. It contains the AP (PDA), BL, CP and CSC files, plus a HOME_CSC file.
- Download and extract Odin on a Windows PC, and install the Samsung USB drivers if the PC does not detect the phone.
- Switch the device off and boot it into Download mode (usually Volume Up + Volume Down while connecting the USB cable, or Volume Down + Bixby + Power on older models).
- Open Odin. The ID:COM box turns blue when the device is connected.
- Load the files in their slots: BL, AP, CP and CSC. Use HOME_CSC to keep your apps and data, CSC to wipe the device.
- Leave Re-Partition unticked and click Start. The device reboots when Odin shows PASS. The first boot after a flash can take a few minutes.
Step-by-step PDFs: 5-file firmware and 1-file firmware.
What the build numbers mean
PDA / AP (A205SKSU4BTF2) is the Android system build; its last three characters encode the year, month and revision. CSC (A205SSKC4BTF2) is the region and carrier configuration, and CP is the modem firmware. The product code SKC identifies the region or carrier this package was made for (Korea (SK Telecom)). Flashing a package for a different product code changes carrier features and can be refused by the bootloader, so pick the one that matches the CSC shown under Settings › About phone › Software information.