EX3400 is boot looping. The kernel cannot be found, reinstall is required.
Power off the EX3400
1) Download the appropriate image for the device (ex: "junos-install-media-usb-arm-32-15.1X53-D59.4-limited.img.gz
")
2) Extract the image
3) Write the extracted image to a USB-device using dd
with bs=1m
or bs=1M
depending on version
4) Insert the USB-device and power on the EX3400
5) Hit 5 for [M]ore options
and 5 again for [B]oot prompt
6) Run lsdev
and confirm device disk1s1a
exists
7) Run set currdev="disk1s1a"
8) Run include /boot/loader.rc
to reboot the device
9) Wait for the installation to complete - be patient.