Thanks for your help.Did you did the OEM unlock under developer setttings? Also did you typed in fastboot mode, fastboot oem unlock , if you did continue to the next step, go to device manager and update the driver if it shows up as USB developer, then go back your platform tools CMD window and type fastboot devices
I check oem unlock in developer options menu
I didn't do was the fastboot oem unlock command (I didn't see it in the instructions)
My problem is that now it doesn't start, it doesn't recognize adb or fastboot.
In device manager it appears as android adb interface (attached screenshot)
The tablet starts and stays on screen with robot (attached screenshot too)
any idea how to solve?