Once you've obtained the relevant firmware from Juniper you can either download it via https:
file copy https://cdn.juniper.net/software/junos/XX/XX.tgz /tmp XX.tgz
or alternatively if you need to download it from a named routing instance you'll need to download it over ftp firstly:
ftp routing-instance <instance-name> <ftp-host>
start shell
md5 /tmp/<firmware>.tgz
request system software add validate /tmp/<firmware>.tgz
The system will then extract the firmware and reboot immediately.
To verify the Junos firmware version after reload issue:
show version
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