[Xperia Z2 Q&A, Help & Troubleshooting] Bendik1101:
Need help unlocking bootloader on Xperia z2 using flashtool (windows 8.1)

Hi, I posted this on a thread a couple of days ago and someone said I rather should post it here. So I hope somebody can help me with my issue. Sorry for my poor english.

This is the first time im trying to root a phone.

I bought the xperia z2, and when the official way to onlock the bootloader failed (sony), I tried to use Flashtool.

I started with downloading the flashtool, and followed every step to download it correctly. When everything was set, I connected the phone to the pc while holding the minus volume button.

The phone then connects to the pc and flashtool starts unlocking the bootloader. But after a couple of seconds the phone disconnects automatcally. It isnt something wrong with the USB cable, it connects fine without the flashtool.

This problem persists after trying over and over again. I have reinstalled flashtool and all the drivers. Turned off antivirus and changed the pc setting so it enables me to install the flashtool hardwares. Im using windows 8.1.

The message I get from flashtool from I start up flashtool til the phone disconnect is this:

24/015/2015 11:15:40 - INFO - Flashtool Version 0.9.18.5 built on 14-02-2015 15:30:00

24/015/2015 11:15:40 - INFO - Executing search strategies to find proxy selector

24/015/2015 11:15:40 - INFO - No proxy found for IE. Trying next one

24/015/2015 11:15:40 - INFO - Strategy firefox failed trying next one : No Firefox installation found

24/015/2015 11:15:40 - INFO - No proxy found for java. Trying next one

24/017/2015 11:17:31 - INFO - Syncing devices from github

24/017/2015 11:17:31 - INFO - Scanning devices folder for changes.

24/017/2015 11:17:35 - INFO - Pulling changes from github.

24/017/2015 11:17:37 - INFO - Devices sync finished.

24/017/2015 11:17:42 - INFO - Device disconnected

24/023/2015 11:23:42 - INFO - Please connect your device into flashmode.

24/023/2015 11:23:50 - INFO - Device connected in flash mode

24/023/2015 11:23:51 - INFO - Opening device for R/W

24/023/2015 11:23:51 - INFO - Reading device information

24/023/2015 11:23:51 - INFO - Phone ready for flashmode operations.

24/023/2015 11:23:51 - INFO - Current device : D6503 - BH91JLJL16 - 1282-0508_R5C - 1278-4770_23.1.A.0.690 - GLOBAL-LTE_23.1.A.0.690

24/023/2015 11:23:51 - INFO - Processing loader.sin

24/023/2015 11:23:51 - INFO - Checking header

24/023/2015 11:23:51 - INFO - Flashing data

24/023/2015 11:23:51 - INFO - Processing of loader.sin finished.

24/023/2015 11:23:52 - INFO - Loader : S1_Root_9c84 - Version : MSM8974AB_7 / Boot version : S1_Boot_MSM8974AB_LA3.0_L_15 / Bootloader status : ROOTABLE

24/023/2015 11:23:52 - INFO - Start Reading unit 000008B2

24/023/2015 11:23:52 - INFO - Reading TA finished.

24/023/2015 11:23:52 - INFO - Ending flash session

24/023/2015 11:23:52 - INFO - Now unplug your device and restart it into fastbootmode

24/023/2015 11:23:52 - INFO - Device connected in flash mode

24/023/2015 11:23:52 - INFO - Device disconnected

24/023/2015 11:23:53 - INFO - Bootloader unlock canceled

24/025/2015 11:25:41 - INFO - Device connected with USB debugging off

24/025/2015 11:25:41 - INFO - For 2011 devices line, be sure you are not in MTP mode

24/026/2015 11:26:08 - INFO - Device disconnected

I do have USB debugging on.