Downgrade Motorola XT1541 baseband modem for unlocking

Fix Motorola xt1541 unlock Unsupported phone model

If you have been trying to unlock Motorola XT1541 with unsupported phone model error, that’s because your device is on Android 6.0.1, with 2017 security patch, which sigma key hasn’t supported yet.

see log:

SigmaKey 2.33.07b1 Qcom: Direct unlock
Motorola QC Diag Port (COM154), Provider: Motorola, Driver ver.: 5.1.0.0, Date: 3/1/2013, USB\VID_22B8&PID_2EC5&REV_????&MI_00
Firmware: MPSS.DPM.2.0.2.c1.8-00022-M8936FAAAANUZM-1
Date: Jul  8 2015 02:09:22, Jul 03 2015 06:00:00, EAAAANVZ
Software IMEI: 355489069772260
Bluetooth address: 000000000000Unlocking phone…….Unsupported phone model

To fix unlock unsupported phone model, you would need to downgrade your Moto XT1541 modem baseband to Android 5.1.1 modem

Before you downgrade, you may need to do a few things:

• Unlock Bootloader
• Root Moto XT1541 and install Supersu.zip
• Downgrade modem baseband

Now Let’s Get Started.

To Unlock Bootloader for Motorola XT1541, PLEASE FOLLOW THIS LINK

On the above link, you’ll be asked to register for a motorola account, please do so, and proceed with bootloader unlock

Once bootloader is unlocked, download twrp recovery for XT1541

Download Supersu from Chainfire

Enable Oem Unlock in Developer Option and usb debugging

Power Off device, Boot to fastboot mode by holding Volume Down and power key

Connect device to Computer, download Minimal adb and Fastboot drivers

Extract the minimal adb and fastboot drivers downloaded above, copy the twrp recovery into the root

directory of your fastboot drivers folder

Rename your twrp recovery to “recovery”

Issue the following command:
fastboot boot recovery.img

Your Moto device will be booted to twrp recovery mode, and device internal storage will be mounted on your computer.

Copy supersu.zip downloaded above to the root directory of your Moto Phone Storage

Click Install, choose Supersu.zip and swipe to the right to install

Wait for Supersu to completely installed, click Reboot System

With the above guide, you’ve rooted Moto XT1541

Download Moto XT1541 Baseband/Modem below link to downgrade
DOWNLOAD LINK


Connect Moto XT1541 in Fastboot Mode

Extract the zip file, ,

Open Ultimate Multi Tool – GSM Software.

Select Motorola QC, from the drop down, choose Downgrade Baseband, click on the three dots and go to the extracted firmware folder and choose NON-HLOS.bin and press execute.

Modem file will be flashed and your device will be on 6.0.1 with 5.1.1 baseband

Goto setings enable usb debugging 

Now Open Sigma Box Firmware, Choose Qualcom Platform

Boot device into fastboot mode, use volume down scroll to BP Tools and press power key

Download motorola Modem_Diag driver here (Link will be provided shortly)

Connect moto XT1541 Powered on to Computer

Select Moto Diag port

Press Direct Unlock

Successful Unlock Logs:

--------- 2019-09-21 21:16:58 ---------
SigmaKey 2.33.07b1 Qcom: Direct unlock
Motorola QC Diag Port (COM154), Provider: Motorola, Driver ver.: 5.1.0.0, Date: 3/1/2013, USB\VID_22B8&PID_2EC5&REV_????&MI_00
Firmware: MPSS.DPM.2.0.2.c1.8-00022-M8936FAAAANUZM-1
Date: Jul  8 2015 02:09:22, Jul 03 2015 06:00:00, EAAAANVZ
Software IMEI: 355489069772260
Bluetooth address: 000000000000
Unlocking phone.........Done
Restarting phone....PLEASE RESTART PHONE MANUALLY!
Done