Hello,
I have Galaxy Note8 and which is dead after the july security patch.
First they provide an Buggy update as a name of July Security patch after installation Phone's dead no network which is the main functionality of a phone then service cen...
New update is also live now but i think that you are not able to download new software now because software update is also not working now.
So, just go to Service center and pay them Rs 236 if your phone is out of warranty.
Hope it helps you.