mycket av denna information är baserad på det som developer Sony publicerat på sin egen Webbsidan andra tillverkare gör
liknade som expemplel HTC där man kräver en upplåsnings kod
"fastboot oem unlock 0x<insert your unlock code>"
How to unlock bootloader - Open Devices - Sony Developer World
Den information jag får fram krävs också nu mera samma steg som htcdev använder sig av
(Unlock your device)
To unlock your device you need an unlock code, which you get by entering your device IMEI, IDID or MEID number in the generator below.
Note: Dual SIM devices have two IMEI numbers. Use IMEI 1 in order to get the correct unlock code for your device.
Unlock Bootloader
What is this?
By unlocking the bootloader, it’s possible to put custom ROMs on your Xperia™ device. However, we recommend standard users not to unlock the bootloader, as it is not needed. We are proud to deliver great software experiences through our rigorously tested and official software releases. If you are not familiar with the risks involved, you should not proceed further.
(Preparations)
Before you proceed to unlock the bootloader of your device, you should do a complete back-up of the system. Unlocking the bootloader will trigger a factory reset that erases all device settings, user data, third-party applications and associated data from the device’s hardware storage. If your device, or part of your device, is encrypted, the keys used for decryption might also be erased, leaving contents cryptographically inaccessible. Pre-installed Sony applications and data stored on removable storage (such as a micro SD card) will not be affected. The factory reset will return the device to the condition it was in when shipped from the factory. In addition, if you have enabled My Xperia, this function must be turned off before you can unlock your device.
Certain pre-loaded content on your device may also be inaccessible due to the removal of DRM security keys. For devices running recent software versions, for instance Xperia Z3, the removal of DRM security keys may affect advanced camera functionality. For example, noise reduction algorithms might be removed, and performance when taking photos in low-light conditions might be affected. The secure user data partition may also become inaccessible, and you will not be able to get any more official software upgrades if you unlock the bootloader.
(Check if the bootloader can be unlocked on your device)
It is only possible to unlock the bootloader for certain releases. To check if it is possible to unlock the bootloader of your device, follow these steps:
In your device, open the dialer and enter *#*#7378423#*#* to access the service menu.
Tap Service info > Configuration > Rooting Status. If Bootloader unlock allowed says Yes, then you can continue with the next step. If it says No, or if the status is missing, your device cannot be unlocked.
Install the device drivers and platform tools
Get the Google USB Driver | Android Developers
aktivera USB-felsöking om så kräv för upplåsning av bootloadern krävs detta
aktivera OEM-upplåsning denna funktionen är inte aktiv för ens bootloadern är upplåst
Download and extract the Platform tools zip file
SDK Platform Tools release notes | Android Developers
Connect to Fastboot
Turn off your device.
Connect a USB-cable to your computer.
On your device, press the Fastboot key (Volume up for most devices, see Useful key combinations) at the same time as you connect the other end of the USB-cable.
Windows users: Open the Devices and Printers directory, right-click on the fastboot driver and press Update. Browse and point towards the location of the new android_winbus.inf file.
When your device is connected, open a command window on your computer and go to the
platform-tools folder within the Android SDK folder.
Enter the following command:
fastboot devices
Verify that you get an answer back without any errors.
när du gjort allt detta och förstår vilken risk det innebär att göra detta så gå vidare
Enter unlock key
WARNING! The command below contains your unlock key. If you perform this step, you will unlock the bootloader. This may void your warranty and/or any warranty from your operator.
Note: In this step you will need the unlock code for your device.
If you still want to unlock the bootloader of your device, enter the following command:
fastboot oem unlock 0x<insert your unlock code>
Verify that you get an answer back without any errors.
Done! You have now unlocked the bootloader of your device.
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