No video output after reflashing

Please provide the following info (check/uncheck the boxes after creating this topic):
Software Version
[*] DRIVE OS Linux 5.2.6
DRIVE OS Linux 5.2.6 and DriveWorks 4.0
DRIVE OS Linux 5.2.0
DRIVE OS Linux 5.2.0 and DriveWorks 3.5
NVIDIA DRIVE™ Software 10.0 (Linux)
NVIDIA DRIVE™ Software 9.0 (Linux)
other DRIVE OS version
other

Target Operating System
[*] Linux
QNX
other

Hardware Platform
[*] NVIDIA DRIVE™ AGX Xavier DevKit (E3550)
NVIDIA DRIVE™ AGX Pegasus DevKit (E3550)
other

SDK Manager Version
1.9.1.10844
[*] other

Host Machine Version
[*] native Ubuntu 18.04
other

Hi! About a week ago, I ran the sudo apt upgrade command without realizing that it would break my video output after reboot. I then discovered that the only solution to this problem was to reflash Xavier. Consequently, I reflashed both Xavier A and B, but my output is still missing. I’ve verified that my power supply and HDMI cable are both functioning perfectly. How can I resolve this issue?

Dear @swiecilo ,
Did you check Install DRIVE with SDK Manager :: DRIVE Platform Installation Guide with NVIDIA SDK Manager?

Also, please check removing persistent data across flashing. Please see How to do factory reset for both Xavier modules on DRIVE AGX? Drive OS reinstall at least does not change the nvidia password - #19 by VickNV