Assistance for Flashing JetPack 5.1.2 on Pixhawk Jetson Board

[a.erdemkok]

When i was flashing jetpack i was using that method :

How to install JetPack 5.1.2 using SDK Manager 2.0 and host computer running ubuntu 22.04?

Hello My goal is to run ubuntu 20.04 on Jetson Orin Nano Dev Kit. Jetpack 6 will install Ubuntu 22.04 The dropdown option only allows me to select Jetpack 6 my host machine is Ubuntu 22.04 I am not very advanced but am familiar with SSH commands, flashing SD cards etc. Also please indicate when to change to recovery mode and when to remove the jumper. thank you!

but that method is sometimes does not working.

I have used another ubuntu 20.04 pc for fixing that error.
Thanks for helping …