We have a juniper mx240 with version 9.1R1.8 and we need to update to version 15.1R6.7 but it is not posible to update directly. It is not possible to obtain software prior to version 14.1 in the juniper download center, how can we obtain the software versions necessary to update from version 9.1R1.8 to version 15.1R6.7?
JTAC has access to previous versions of Junos so you can create a case and have them provide the needed intermediate versions.
This will of course require an active maintenance contract to do so.
Thank you all for the information.
This has already been discussed before:
Please check : https://forums.juniper.net/t5/Junos/MX240-upgrade-path/td-p/317280
Also take a look at Page 36 of