Use a multimeter to test continuity between the chassis and known earth ground (resistance < 0.1 ohm).

set / network-instance mgmt route 0.0.0.0/0 next-hop 192.168.1.1

sr_cli

Check LEDs on the front panel:

Familiarize yourself with the front and rear panel layout.

: Use a Linux machine to copy the software image to an SD card using the Insert SD Card