[Q] Need Help Unbricking D801 topic

I have now learnt my lesson - never flash firmware onto a phone after 1am! A tired brain can make simple mistakes far too easily. In this case, I accidentially flashed a version of TWRP 2.8.2.1 meant for a D800 onto my T-Mobile D801. So now the phone just sits at the LG logo with the LED slowly pulsing diferent colours until the battery runs out. :(

I have now gone through every thread I could find on this forum, as well as other places, about unbricking G2s. I tried opening the phone and shorting the test pins, as shown here - https://www.youtube.com/watch?v=Muvcw5eVwH4 Visually not much changed on the phone, although now it seems to sit with the LED on red most of the time. I don't seem to be able to make it go into Download Mode, as it still sits at the LG logo (or is that normal with D801s?). I'm wondering if maybe I should try the shorting method again, but without rdisconnecting the battery this time.

Plugging the phone into a Windows 7 PC via USB, it installed two two devices, "LGE ANdroidNet USB Modem" and "LGE AndroidNet USB Serial Port". This seems to indicate that the device isn't quite totaly bricked.

Any idea where I should go from here? TIA