Jetson AGX Xavier not booting after trying to upgrade Jetpack from 4.3 to 4.4

There is no update from you for a period, assuming this is not an issue any more.
Hence we are closing this topic. If need further support, please open a new one.

  1. Can you share what is changed in apt-source list?

  2. Could you share current boot up log or dmesg with us? I am not sure if this is just an issue from hdmi driver. If it is, then you should still be able to remote acces to it through ssh or uart console. HDMI dies does not 100% represent the system is dead.