Root Samsung Galaxy A51 and Flashing TWRP. Make sure the bootloader are unlocked, OEM unlock option is grey out. Enter Download Mode : Turn Power Off. Press and hold Volume Up + Volume Down key together, while pressing these keys, connect the phone to computer, then press volume up once. Open ODIN, IMPORTANT!: Try it free. in this video i will show you how to put Samsung dawnload mode A51 /A31 /A21/A10 MODE for upgrade firmware -- GSM GUIDE # (Donation!) & Make me Happy Thank Samsung Stock Firmware. Download and Extract the Odin Zip file to your computer. Double click on the ‘ Odin3.exe ‘ file to open the Odin tool. While your Samsung Galaxy is in Download Mode, connect it to your PC using a USB Cable. The COM port on the Odin tool will now show some activity and will light up. Heimdall connects to a mobile device over USB and interact with software running on device known as Loke. Loke and Heimdall communicate via the custom Samsung-developed protocol sometimes referred to as the 'Odin protocol'. Low-level USB in Heimdall is handled by the popular open-source USB library, libusb. Now, you have to boot the device into the Download mode. To boot into the Download Mode: Press and Hold Volume Down, Home and Power button. When the phone vibrates Leave the Power button, but Keep on holding the Volume Down and Home Button till you boot into the Download Mode. In the Download Mode, you will be able to see a Warning Yellow Put your device into download mode by pressing and holding the Volume Down + Home + Power key. Plug your phone into your PC. Open up Device Manager on your PC (Control Panel > System > Device Manager). Under “Libusb (WinUSb) devices” right-click on “Samsung USB Composite Device” and choose Properties. Downgrade A51 firmware. 24-02-2020 05:46 PM - last edited ‎24-02-2020 07:21 PM. I have a Galaxy A51 EU running build A515FXXU1ASL6 having issues with streaming audio with Bluetooth. (Sound cuts randomly for 1 -2 seconds.) Is it possible to downgrade firmware to A515FXXU1ASKJ via Odin without voiding warranty? So after doing the previous procedures and your Galaxy A51 is still not charging, what you have to do next is to perform the Forced restart. It’s a simulated battery removal that will refresh Boot Samsung Galaxy A21s into Download Mode / Odin Mode. Power off your Phone. Plug one end of the USB cable to PC and while holding the Volume Up + Volume Down button connect the other end of the cable to your device. You should see the Warning Screen with two options – Volume Up to Continue and Volume Down to Cancel and restart the phone. No matter the way i choose ,the Phone don't wann bot in to the download Mode. If i boot to the download Mode, it will put mehr in the Standard bootloader Mode but not realy. It stays in Green "booting to bootloader" but it dont boot into the. It's live the download Mode is not existing. kIiEG9.