How to Flash Stock ROM on Samsung Galaxy S21 FE 5G Using Odin

Preparing Your Samsung Galaxy S21 FE 5G

• 💡 Check your phone's model name (e.g., G990B2) and software information, specifically the baseband or kernel version, to identify the current revision number.
• ⚠️ You can only install the current revision or a newer one; installing an older revision is not possible.
• 📌 Before proceeding, sign out of your Google account to streamline the setup process after flashing.
• 🔌 Power off your phone completely to prepare it for entering download mode.

Downloading and Installing Necessary Software

• 💻 You will need a computer and a data transfer cable.
• 💾 Download the correct firmware for your specific phone model and region. Websites offering faster download speeds can be used.
• ⚙️ Select the appropriate CSC code; the non-branded EUX version is recommended for a clean installation.
• 📥 Download Samsung USB drivers and Odin (version 3.14.4 is recommended).
• 🖱️ Install the Samsung drivers and restart your computer to ensure they are properly recognized.
• 📂 Unpack the downloaded firmware file using a tool like WinRAR.

Flashing the Stock ROM with Odin

• 📲 Connect your phone to the computer using the data cable.
• 🔊 To enter download mode, press and hold volume up and volume down buttons simultaneously, then plug in the cable. If the screen doesn't appear, briefly hold the power button as well.
• ✅ Once in download mode, press volume up to confirm. You should see a blue screen indicating connection in Odin's logs.
• 📁 In Odin, load the firmware files: BL, AP (this is the largest file and may take longer to load), CP, and CSC (use the file that erases data, not 'Home CSC', for a full reset).
• ▶️ Click Start to begin the flashing process. Common errors are due to missing drivers, not restarting the computer, or using an incompatible cable or older revision.
• ⏳ The flashing process will take several minutes. Once complete, the phone will automatically reset and reboot.

Post-Flashing Setup

• ⏳ Be patient during the first boot, as it may take a few minutes for the new system to load.
• ✨ After the phone restarts, you can proceed with the initial setup as you would with a new device.