[Sony Xperia 5 II Guides, News, & Discussion] mhys33:
*I don’t take responsibility for any bricked devices or any issues that you may encounter. Do everything at your own risk. Read till the end before you start.​

Since the Xperia Au variants don’t allow for bootloader unlock by default, the only way I found was to use qUnlocktool to change the Bootloader unlock allowed From No to Yes. I have successfully tried this on an SOG02, not been tested on SOG01 personally.

Things you will need -

1. The phone obviously

2. A windows PC

3. USB-C cable

4. qUnlocktool - https://we.tl/t-XO7zUJanov (credit to canadaunlocking.com for this link)

5. Unlocking credits – You can use canadaunlocking.com or martview.com to purchase one credit to use the tool ($21 - $35 USD depending on which website)

https://canadaunlocking.com/unlock-sony

https://www.martview.com/sony-unloc...time-24-hours-server-service--sku-imu-75.html

Both are trusted as far as I know

Here are the steps listed briefly:​

1. Charge your phone to at least 50% or more, take a backup just in case. Power off the phone.

2. Open your windows PC and turn off any antivirus or windows defender. These will interfere with the program.

3. Connect the USB-C cable to the PC. In case of desktop, it’s preferred to use the ports on the motherboard directly.

4. Unzip the qUnlocktool zip file and it should contain 32 bit and 64 bit drivers. Install according to the system that you have. If you think these drivers are outdated, look for newer drivers on the Sony website for your specific device.

5. Start the tool and enter the username and password you received when you purchased the credit earlier. Click on check credit ONLY ONCE. Make sure you have 1 credit (Server credit left/used: 1/0)

6. Click SIM unlock and the tool should instruct you to connect the phone with USB-C while holding down the volume down button.

7. If you see UNLOCK DONE, you have succeeded. It may take a few minutes so be patient.

8. Disconnect your device

DO NOT delete the qUnlocktool folder or any of the files just yet. There should be a backup folder we may need later.

Once the phone boots, open the dialer and enter *#*#7378423#*#* to access the service menu. Go to service info>configuration>rooting status. If bootloader unlock allowed says Yes, then proceed to unlock the bootloader from the Sony website.

https://developer.sony.com/develop/...d/unlock-bootloader/how-to-unlock-bootloader/

Important note : You may lose SIM functionality once you unlock, but don’t worry, do the following -​

1. Open up your PC, start qUnlocktool as admin.

2. Power off your phone

3. Connect while holding volume down.

4. In the qUnlocktool, use the write backup option

5. Boot the phone. You should have regained SIM functionality.

Edit: If you have somehow deleted the qUnlock folder or are unable to gain sim functionality, some users have reported that a restore with Xperia Companion will also restore SIM functionality.

TWRP​

1.Grab the twrp of your choice. Check XDA or the telegram groups

2. Power off the phone. Make sure USB debugging is enabled beforehand.

3. connect phone in fastboot mode

4. Open terminal or CMD in platform tools folder, make sure twrp (recovery.img) is in the same folder.

5. type “fastboot devices”. Your device should be shown

6. type “fastboot flash recovery recovery.img”

7. type “fastboot reboot”

Voila