https://kb.juniper.net/InfoCenter/index?page=content&id=KB21476&actp=METADATA#mtptxmx_series
Upgrading/Downgrading/Reinstalling Junos
https://kb.juniper.net/InfoCenter/index?page=content&id=KB11409&actp=METADATA
https://kb.juniper.net/InfoCenter/index?page=content&id=KB21476&actp=METADATA#mtptxmx_series
https://kb.juniper.net/InfoCenter/index?page=content&id=KB11409&actp=METADATA