[j-nsp] Juniper M20 with old JUNOS version gives upgrade problem

[InterXS - L. Croese]

Hi List,

We recently bought a Juniper M20 to expand our lab setup.
It runs JUNOS 5.5R2.3

I want it to upgrade it to JUNOS 9.0 however we started to archive JUNOS 
versions since 7.1R1.

However a request system software add validate reboot 
jinstall-7.1R1.3-export-signed.tgz gives the following error:

59627557 bytes transferred in 142.9 seconds (407.60 kBps)
Package contains jinstall-7.1R1.3-export-signed.tgz ; renaming ...
Checking compatibility with configuration
Initializing...
Using jbase-5.5R2.3
Using /var/tmp/jinstall-7.1R1.3-export-signed.tgz
Verified MD5 checksum of 
/var/validate/tmp/jinstall/jinstall-7.1R1.3-export.tgz
Using /var/validate/tmp/jinstall-signed/jinstall-7.1R1.3-export.tgz
Using /var/validate/tmp/jinstall/jbundle-7.1R1.3-export.tgz
Using /var/validate/tmp/jbundle/jbase-7.1R1.3.tgz
Using /var/validate/tmp/jbundle/jkernel-7.1R1.3.tgz
WARNING: This base version of JUNOS will not properly
WARNING: support this package.  Please install base OS
WARNING: JUNOS 7.0 or newer ASAP.  You can do this via
WARNING: a jinstall package or install-media.
WARNING: Or use the command:
WARNING:        'request system software rollback'
WARNING: to attempt to restore the previous software set.
WARNING: This installation attempt will be aborted.
ERROR: validate-config: jkernel/+REQUIRE fails
WARNING: Current configuration not compatible with 
/var/tmp/jinstall-7.1R1.3-export-signed.tgz

Ofcourse the difference between 7.1R1.3 and 5.5R2.3 is way to big, any idea 
how to get hands on a 6.x jinstall package?

As the router is only for our juniper lab we dont have it under contract so 
opening a JTAC ticket is not an option.

Any ideas?

Thanks,

Leon