nvidia tegra note 7 sucessfully unbricked! with questions.

I successfully unbricked my EVGA Tegra Note 7 with APX procedure thanks to the ADVENT stock image and how-to -guide.
so my question is.

  1. since the advent TN7 is only android 4.3, can i update this safely?
  2. can i proceed rooting my TN7 without bricking my TN7 again?


How did you manage to do this? i’ve tried and sadly, it didn’t unbrick mine. Stuck at TEGRA NOTE logo on boot. Tried the APX restore maaany times, on many usb ports, with many usb cables :(