it is a group of 21 switches that are failing
> show system storage partitions
fpc0:
--------------------------------------------------------------------------
Boot Media: internal (da0)
Active Partition: da0s1a
Backup Partition: da0s2a
Currently booted from: backup (da0s2a)
here is one of them
upgrading from [12.3R6.6] to 12.3.R12.4
junspace reports
Failed to execute RPC get-software-master
device image is not installed properly version in device is 12.3.r6.6