how do i turn usb debuging on from fastboot? My touch doesn't work and I accidentally reset my phone from recovery.Now I am stuck on the phone setup phase and cant get anywhere.I am trying to mirror the phone's screen into a pc but says it needs usb debuging enabled in phone.
If the device supports USB host mode you can connect a USB-OTG (USB on the go) cable and connect a USB mouse or a USB keyboard to bypass the broken touchscreen. Then you can navigate to developers options to turn the usb debugging on.
Find out more at : How to turn on USB debugging

Also have a look :XDA Developers: Remotely turn on USB debugging which explains different workaround but it need touchscreen to work.