Bootloader unlock failed

General
#1

Sony Xperia 10 III (Dual-Sim), SFOS 4.5.0.25

I reflashed the smartphone and wanted to close the bootloader. After I closed the bootloader via fastboot (with “fastboot oem lock”), I was able to start the device exactly once. After that, I received a system message that the system was corrupt and the device switched off again automatically after five seconds. This means that I no longer have any access to the smartphone.

Afterwards I tried to flash the smartphone again. Unfortunately, I didn’t write down the IMEI. However, I discovered that there are several numbers printed on the SIM card compartment that could be the IMEI.

So I started fastboot again and received a response via “fastboot devices” in the form “XX615X2X4X fastboot”. The smartphone is obviously recognised. However, if I now enter “fastboot oem unlock” and the assumed IMEI (15 digits), I get the error message “FAILED (remote: ‘Incorrect format for unlock data’)”.

What am I doing wrong? Does anyone know a way of finding out the IMEI or verifying the assumed one? What does the format look like? Or is there another way (with Linux) to get access to the bootloader/ the smartphone?

#2

You don’t use the IMEI to unlock the phone. You need an unlock code.

https://developer.sony.com/open-source/aosp-on-xperia-open-devices/get-started/unlock-bootloader

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#3

But according to Sony I do need the IMEI to get the unlock code … And I don’t have any access to the smartphone

#5

The IMEI can be found on the SIM holder.

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#6

If you still have the original packaging, usually there is IMEI printed on the box.

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#7

That would be good, but unfortunately I no longer have a box. It’s also stupid that I can’t get any further on the Sony website (Unlock bootloader | Developer World). I haven’t yet been able to work out why I wasn’t redirected when I selected the right smartphone and accepted the two click boxes below.

#8

Above the two click boxes you also have to enter your IMEI, which you find on the sim holder (very small characters)

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#9

OR you could open the phone dialler app and enter

*#06#

Magic!

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#10

Embarrassing, embarrassing! I thought the input field was a heading. Bootloader is open and the new system is installed. Many thanks to everyone for their help.

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