
I already done flashing my Xperia Z 4.4.2( Kitkat ) to 5.0 ( Lolipop ) I know this is an old thread, but I'm wondering if anyone knows where to get the flashtool? Is it called "flashtool" or does it go by another name? after restart your pc open the command promt at fastboot folder then type "fastboot devices" and you will see the list of devices in fastboot. after complete the installation, open the cmd in administrator again and type "bcdedit /set testsigning off" and don't forget to restart again your pc.Ħ. NOTED : when the installation process there will popup window warning just Click "install the software anyway"Ĥ. after pc your restart install the flashtool driver at "C:\Flashtool\drivers\Flashtool-drivers.exe" and select "flashtool driver & fastboot driver" after install the flashtool, open cmd in administrator then type "bcdedit /set testsigning on" and then restart your pcģ. For further queries, let us know in the comment below.Hey everybody i just found the solution for the topic.Ģ. We assume you’ve found this guide helpful.

Now, you can flash files to the system partition without getting fastboot failed errors.


Second, we hope that you’ve already enabled USB Debugging on your handset.To do that, connect your device to the PC via a USB cable.Now, if your device has the A/B partition type, then you’ll need to boot into the boot partition by executing the following command.
