8. Fastboot flash using the usual procedure the firmware you were on before bricking it. Take the firmware from
here. In my case this was 7.2.3. If you were rooted use the "Developer Only" image instead of the regular.
fastboot flash staging blob
fastboot flash boot boot.img
fastboot flash recovery recovery.img
fastboot flash system system.img
fastboot flash vendor vendor.img
fastboot reboot
Give the first boot 15 minutes and then manually reboot if needed and again wait longer than usually. It should now work.
Don't format your drive at any stage and you will not loose your data.
The reason for bricking in most cases is flashing firmware experience 8 and above, the blob file kills the shield, the nvidia firmware engineers are obviously not up to their hardware level.
Good luck!