Yes i have tried to acces the bootloader,using this tutorial
https://www.youtube.com/watch?v=z2grHO-vqCM but it seems i cant acces the bootloader,any suggestions please the device is an Advent Vega device bought in the UK.
Ok, First things first.
1) Go to settings --> about tablet --> tap build number 10 times and you will unlock developer options.
2) Backup to Developer options and check that usb debugging is on.
3) Power off the device. Then press and hold the volume up button and press and hold the power button at the same time till it boots into the bootloader. Then you have approx. 5 seconds to make a choice or it will continue to boot to the normal desktop. You don't have to select the choice, just press the volume keys to any choice to halt the timer.
4) On the computer, open cmd and go to the directory with adb.exe and fastboot.exe are located. Type adb devices to see if you get a response with a bunch of numbers followed by device.
5) On the device, press the volume key to highlight reboot fastboot, then press power button to select. You should be in fastboot.
6) On the computer type fastboot oem unlock and profit!!!!
Super tool does the same thing, plus a lot more, all automated for convenience.