Flashing your Samsung Galaxy device can fix critical software issues, restore performance, or update your system manually. Whether you’re dealing with a bootloop, unbricked device, failed OTA update, or simply want to downgrade your firmware, learning to use Odin safely is essential.
This step-by-step guide walks you through flashing 4-file Samsung firmware using Odin — the same internal tool used by Samsung technicians — for a stable and reliable installation in 2025.
See also: 5 Best Android Apps for VIZIO SmartCast TVs (2025 Updated Guide)
⚠️ Important Warning Before You Begin
Flashing firmware can be risky. If the incorrect files are used or the process is interrupted, your device can become permanently bricked.
Proceed at your own risk.
We are not responsible for any damage, data loss, or malfunction caused by improper flashing.
Pre-Flash Checklist
Before starting, make sure you have the following:
You Will Need:
- A Windows PC (Windows 10 or 11 recommended)
- Odin Tool v3.14.4 or newer
- Samsung USB Drivers (latest version)
- 4-file stock firmware matching your exact model and region
- Original or high-quality USB cable
- Device battery charged to at least 50%
Phase 1: Preparation & File Collection
Step 1: Download Odin and Samsung USB Drivers
- Download Odin Tool:
Get the latest official Odin build (v3.14.4 or newer) from a trusted source such as XDA Developers.
Extract the ZIP file to an easy-to-access folder on your PC. - Install Samsung USB Drivers:
Download and install the latest Samsung USB Drivers for Windows.
Once installed, reboot your PC to ensure the drivers are fully recognized.
Step 2: Download the Correct 4-File Firmware
Your firmware must match your device model and region exactly.
You can find your model number and CSC code under:
Settings → About Phone → Model Number / Software Information.
Download firmware from reputable sources like:
After downloading, extract the ZIP or RAR archive. You’ll get up to five files, typically named like this:
| File | Purpose |
|---|---|
| BL_…tar.md5 | Bootloader |
| AP_…tar.md5 | System and recovery image (largest file) |
| CP_…tar.md5 | Modem / Radio |
| CSC_…tar.md5 | Country / Carrier data — wipes all data |
| HOME_CSC_…tar.md5 | Keeps apps and data — no factory reset |
Phase 2: The Flashing Process
Step 3: Boot the Device into Download Mode
To enter Download Mode, power off your Samsung device completely, then use one of the following key combinations based on your model:
| Device Type | Key Combination |
|---|---|
| Modern (S20, Note 20, and newer) | Plug the USB cable into PC → Hold Volume Up + Volume Down while connecting USB to phone |
| Older devices with Home button | Hold Volume Down + Home + Power |
| Devices with Bixby button (no Home) | Hold Volume Down + Bixby + Power |
Step 4: Load Firmware Files into Odin
-
Run Odin.exe as Administrator on your PC.
-
Connect your device to your computer using the USB cable.
- The ID:COM field should turn blue and display a port number (e.g., 0:[COM4]).
- If it doesn’t, recheck your drivers or try a different USB port.
-
Load each file into its respective slot in Odin:
- BL → Select the file starting with
BL_ - AP → Select the file starting with
AP_(largest file, may take time to load) - CP → Select the file starting with
CP_ - CSC → Choose one of the following options:
CSC_...→ Performs a clean install (recommended for fixing errors or downgrades, wipes data).HOME_CSC_...→ Preserves data (safe for regular updates, not for downgrades).
-
Go to the Options tab and ensure only the following are checked:
✅ Auto Reboot
✅ F. Reset Time
❌ Re-Partition (must remain unchecked!)
Step 5: Start the Flash
- Double-check all fields are correctly loaded.
- Confirm that your device is connected (blue ID:COM box visible).
- Click Start.
➡️ Do not disconnect your device or close Odin during the process.
The flashing may take several minutes depending on your device and file size.
Step 6: Completion
Once the flashing process is successful, Odin will display a green box with “PASS!”
Your device will automatically reboot.
- Do not panic if the first boot takes longer than usual (5–15 minutes).
- After booting, set up your device normally.
If Odin displays “FAIL!” or your phone is stuck in a bootloop, proceed to the troubleshooting section below.
Phase 3: Troubleshooting & Recovery
Common Issues and Fixes
| Issue | Possible Cause | Recommended Action |
|---|---|---|
| Odin shows “FAIL!” | Corrupted file, USB error, or wrong firmware | Reboot PC, redownload firmware, reconnect USB, and retry. |
| Device not detected | Missing drivers or bad cable | Reinstall Samsung USB Drivers, use a different USB port or cable. |
| Bootloop after “PASS!” | Data conflict from old cache or incompatible HOME_CSC use | Boot into Recovery Mode → Wipe Data/Factory Reset → Reboot. |
| Still stuck after clean flash | Wrong firmware region or hardware issue | Verify model/CSC match. Try a different firmware build or seek professional repair. |
Optional: How to Boot into Recovery Mode
If your device fails to boot properly after flashing:
- Power off (or force power off) your device.
- Hold Volume Up + Power + USB connected (for new devices).
- In Recovery Mode, use the Volume keys to highlight Wipe Data/Factory Reset and confirm with the Power button.
Summary
| Task | Description |
|---|---|
| Purpose | Fix bootloops, unbrick, downgrade, or manually update firmware |
| Tool Used | Odin (Samsung’s internal flashing tool) |
| Firmware Type | 4-File Stock Firmware (BL, AP, CP, CSC) |
| Main Safety Tips | Match firmware to your exact model & region, never re-partition, and use proper drivers |
Final Thoughts
Flashing stock firmware with Odin is a powerful recovery method when done correctly. With the right files and preparation, you can restore your Samsung Galaxy device to full working condition — safely and reliably.
Take your time, verify each step, and always ensure firmware compatibility before flashing.
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