| # | Topic | Summary |
|---|---|---|
| 1 | What is Samsung Binary Bit? | Explains Samsung firmware bootloader/binary (U1, U2…U9) and why downgrade fails. |
| 2 | How to Check Binary Bit (SW) | Check via build number, download mode, or professional tools. |
| 3 | How to Downgrade Firmware | Step-by-step guide to downgrade safely using Odin. |
| 4 | Where to Download Downgrade Firmware | SamFW, Frija, SamMobile, or DM Unlocker server. |
What’s Samsung Binary Bit?
Samsung firmware comes with a Bootloader version, also called Binary Bit.
• Binary Bit is shown as a number in the firmware build.
• Example: A146BXXU7CXA2 → Binary = 7.
• You cannot downgrade to a firmware with a lower Binary.
• If your phone is Binary 7, you cannot flash Binary 6.
• But you can flash Binary 7 or higher.
👉 In short: Binary = Firmware lock number that controls downgrade compatibility.
How to Check Binary Bit SW
There are different ways to check your Samsung Binary Bit:
1. From Software Info (Settings):
• Go to Settings > About Phone > Software Information.
• Look at the Build Number. Example: A105FXXU6BVG2 → Binary 6.
2. From Download Mode:
• Turn off device → Press Vol Up + Vol Down + USB cable.
• Check Bootloader Version (BL). Example: BL = U7 → Binary 7.
3. Using Tools:
• Professional tools (Z3X, Chimera, Hydra, etc.) also show Binary automatically.
Read more: iRemoval Pro Premium Edition V5.1 A12+ Bypass
How to Downgrade Samsung Firmware for FRP Bypass
To bypass FRP lock using firmware downgrade:
1. Check the current Binary (example: Binary 7).
2. Find downgrade firmware with the same or higher Binary.
• Example: Device on Binary 7 → You must flash Binary 7 firmware (older build date).
3. Download the firmware package (BL, AP, CP, CSC).
4. Put your device in Download Mode.
5. Use Odin Tool to flash the firmware.
6. Once downgraded, apply your FRP bypass method (USB redirect / Alliance Shield / Test Point).
⚠️ Note: If you try to flash a lower Binary, Odin will fail and device won’t downgrade.
Where to Download Suitable Downgrade Firmware
You can download Samsung firmware from:
• SamFW.com (Free firmware download)
• SamMobile.com (Official Samsung firmware library)
• Frija Tool (PC tool for direct Samsung server download)
• DM Repair Tech Server (if you provide firmware to your users)
👉 Always choose the same model number + same region + correct Binary to avoid errors.
Samsung FRP bypass with downgrade firmware is only possible if you carefully check the Binary Bit. Once you know your Binary version, download the correct firmware and flash with Odin. This method works perfectly on Samsung Android 15 devices.
❓ FAQ
Q1: Can I downgrade to any firmware version?
👉 No. You must downgrade only within the same Binary Bit.
Q2: What happens if I flash lower Binary?
👉 Odin will fail, and firmware won’t install.
Q3: Is FRP bypass with downgrade safe?
👉 Yes, if you use the correct firmware and official tools.
Q4: Where is the easiest place to get firmware?
👉 SamFW or Frija Tool for free.
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