If I have two image-based xavier package with the same verion 4.6.1,How Can I update the firmware from one to another?

Hi,as the title said, how can I update the firmware from the same verison?

Please check Basic Flashing Procedures section in Jetson Linux Developer guide
You should be able to find To clone a Jetson device and flash there.

I mean update system via ota not via usb.Do you have any other solution?

See NVIDIA Jetson Linux Developer Guide : Over-the-Air Update | NVIDIA Docs

Thanks. Version 4.6.1 can be updated to another 4.6.1.