Currently, there are 2 kinds of Xperia Z2 lock that do not unlock the bootloader. And also a bit different from the FW version you are using. Currently, most of the Z2 is on genuine FW 69. See FW by the setting / about phone show the last line is 17.1.A.2.69 / 55. Before we start, please make a backup copy of your important data.

Root Xperia Z2 Unlock Bootloader:-

First, Install drivers from here.
Download Z2-Community_Rootkiet-v01.zip And unzip it on your computer desktop.
On Z2 in Setting/about phone/ the last line – 17.1.A.2.69 – clicked 7 times.
Come back to settings and click on the developer’s option.
Tick on USB Debugging.
Connect the cable to the Z2.
Go to the directory Z2-Community_RootKit-V01 and un the runme.bat file. You’ll see “the Installing exploit app” notification as shown below.

Progress will be as shown below.

How To Root Xperia Z2 Unlock Bootloader | Tuesday, Mar 19 2024 12:22PM

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On the Z2 screen will display the following screen -> Select Edit Service info

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Select Configuration
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Go back to the computer and press any button on the computer to continue
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If successful, you will see the message “Removing exploit app”, as shown below

Xperia-Z2-Root-Guide_1-640x323

13. Unplug the cable and restart Z2 and check that there is a successful Superuser app.