Check your current binary in Download Mode (look for "RP SWREV: B:2"). You cannot downgrade from U2 to U1.
When the warning screen appears, press to confirm. Connect your phone to a PC using a reliable USB cable. ⚠️ Critical Reminders
Flashing can erase all personal files. Perform a Hard Reset first if the device is stuck. Check your current binary in Download Mode (look
Originally Android 6.0.1, upgradeable to Android 7.1.1.
Sets the region/country configuration. (Use HOME_CSC to keep your data, or regular CSC to wipe it). 🚀 How to Enter Download Mode To flash any firmware, the device must be in Download Mode : Power off the phone completely. Press and hold Volume Down + Home + Power simultaneously. Connect your phone to a PC using a reliable USB cable
Odin Flash Tool is the standard software used to install these files. 📂 Necessary Firmware Files
A complete "4-file" (Service Firmware) package usually includes: Contains the device's bootloader files. AP (System): The main system partition and core OS. CP (Modem): Handles radio and connectivity. Originally Android 6
Ensure you have the Samsung USB Drivers installed on your computer so Odin recognizes the device. If you'd like, I can help you: Find the latest Odin version for your PC