Nexus 5x stuck on Google logo First time that I've been lost about how to fix an android device. In short, I tried updating the my device to the latest cm13 nightly but that ended up causing the Google logo loop (wouldn't boot into animation). I tried various fixes that I know of (tried reflashing with new Gapps, tried flashing a stock ROM no luck).

My issue now is that I can't use 'fastboot' anymore as my device isn't being recognised and so wondering if there is a fix that can be applied from twrp recovery itself.

Also must mention that device has been rooted (though not sure if it still is as I can't boot into a ROM) &amp; has an unlocked bootloader (which can't be locked either). 

Thanks in advanced.
Get into Recovery, if you flashed a CM13 you probably have a custom recovery installed. Do a factory reset from your custom rom. Alternatively, you can wipe Cache, Data, System individually. 

After this, try rebooting to bootloader and connect your phone to a different PC if your's doesn't recognise the phone. It is preferable if the PC has Linux as it doesn't get you in device driver hassles. If anyway you have no option other than a Windows system, install universal naked drivers if your own device's official drivers doesn't work. Reboot your system and connect your device again to try getting Fastboot mode.