Credentials (username and Password) for NVIDIA Jetson Linux 36.2 (ubuntu22.04/Jetpack-6.0 DP) for own build image

As I already told, no… there is no default credentials… Your rootfs is probably corrupted.

The system will ask you to configure credentials in first boot.

Also, please move to rel-36.3. Rel-36.2 is developer preview only.