Question Unable to relock bootloader - Android 12 - Sony Xperia 1 III

Hi,
Has anyone been able to successfully relock their bootloader after erasing and flashing stock firmware?
The fastboot command "fastboot oem lock" returns:
"FAILED (remote: 'Command not supported in default implementation')
fastboot: error: Command failed"

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Maybe you reboot on wrong fastboot mode, or Try use latest adb fastboot

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YusukeYuu said:
Maybe you reboot on wrong fastboot mode, or Try use latest adb fastboot
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Unfortunately I think Sony my have blocked the ability to relock the bootloader
I am using latest 'platform-tools_r33.0.3-windows' and I've also installed specific Sony fastboot driver from Sony Developers.
I am booting into default 'fastbootd' mode.

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So this command aint work ?
fastboot oem lock

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Yes that is correct, it seems that Sony have sealed up the ability to relock ourselves
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rasseru16 said:
Yes that is correct, it seems that Sony have sealed up the ability to relock ourselves
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maybe need to use the same serial number that you used to unlock the bootloader

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Sakuma_Eitarou said:
maybe need to use the same serial number that you used to unlock the bootloader
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How do you mean. I am using the same phone I used to unlock so the serial number should remain the same?

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rasseru16 said:
How do you mean. I am using the same phone I used to unlock so the serial number should remain the same?
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yes
if you save that number

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Weird, my xperia 1 iii can relock

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rasseru16 said:
Yes that is correct, it seems that Sony have sealed up the ability to relock ourselves
View attachment 5720029
View attachment 5720033
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Click to collapse
Try selecting reboot to bootloader first before using the command

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YusukeYuu said:
Weird, my xperia 1 iii can relock
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Did you also update to Android 12 bootloader?

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rasseru16 said:
Did you also update to Android 12 bootloader?
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Click to collapse
Yes

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You have to reuse the code you used to unlock the bootloader, for example : fastboot oem lock C46...09

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fastbooking said:
You have to reuse the code you used to unlock the bootloader, for example : fastboot oem lock C46...09
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Will give that a go

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fastbooking said:
You have to reuse the code you used to unlock the bootloader, for example : fastboot oem lock C46...09
Click to expand...
Click to collapse
Unfortunately, I still receive the same error, oh well I guess only Sony can repair it and relock the bootloader.

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You need to go on bootloader not fastbootd mode

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YusukeYuu said:
You need to go on bootloader not fastbootd mode
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If I select 'Reboot to bootloader' the screen is black and I need to specify which driver to install, seeing as that mode isn't fastboot I am trying to understand how it would relock the bootloader?
Thanks

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rasseru16 said:
If I select 'Reboot to bootloader' the screen is black and I need to specify which driver to install, seeing as that mode isn't fastboot I am trying to understand how it would relock the bootloader?
Thanks
Click to expand...
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Yes, the screen will go black, but you can use the fastboot command as long as the notification turns blue.

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YusukeYuu said:
Yes, the screen will go black, but you can use the fastboot command as long as the notification turns blue.
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Ok thanks, I cannot get the notification icon to turn blue am I doing something wrong? :/

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You should have read my Guides.
fastboot reboot fastboot is the only command You'll need to switch between fastboot and fastbootd.
But just turn off Your Phone. Hold Volume Up and Connect USB. Blue LED and Done
fastboot oem lock
Done
Do a Software Repair with Xperia Companion after. Just liike told in My Guides. Enjoy