JP 5.1 on Orin NX 8gb?

I need exactly 5.1 version and less than 35.3.1 L4T.

Found this thread, but I’m not sure that I can flash 8gb version.
Is there any easier way to do this? Because I can’t completely understand what’s happening in the 16gb thread. Do I have risks when flashing? The device isn’t mine.

The Orin NX 8 GB was not supported by JetPack 5.1, you can’t use it.
You should use JetPack 5.1.1 at least.