The QFX3500 switch will not upgrade to 12.1X49, and later Junos versions, if it is running a Uboot version (Jloader) 1.1.1 (or earlier). You must upgrade to jloader version 1.1.2, or higher, in order to upgrade to Junos 12.1, or later Junos releases. The QFX3500 switch will not upgrade to 12.1X49, and later Junos versions, if it is running a Uboot version (Jloader) 1.1.1 (or … [Read more...]