Remove or change the password from a Jetson Nano

Question

I received a Jetson Nano with a developer kit (B01) and a micro SD card from a previous research project that I want to continue, but unfortunately I didn't receive the needed password. My question is if there is a way to remove or change the password, so I am able to continue my research with the previous project setup. I am familiar with Raspberry Pis but not with the Jetson Nano, so I would really appreciate your help.

What I tried:

1. Since I don't want to lose the data, I first created a backup of the micro SD card using Win32 Disk Imager, like I would on a Raspberry Pi. Based on the backup and a second micro SD card, I made successfully a copy that I can work on without the risk of losing data.

2. I tried login in with the two defaults: user: nvidia password: nvidia and user: ubuntu password: ubuntu, but it was unsuccessful. The login screen shows a custom username, so my guess is that the defaults were changed or completely deleted.

3. Since the Jetson Nano shows a Ubuntu login screen, my initial idea was to remove the password with this guide. Unfortunately, this guide seems not applicable for the Jetson Nano because I didn't know that it doesn't use Grub.

4. I am currently reading about the serial debug console.