Error messaging:

SSR firmware upgrade failed: Failed to prepare necessary packages for SSR upgrade for version 6.3.5-37.sts

Firmware update was initiated from Mist Cloud for both devices. Current firmware version is : 6.3.4-7.r2

Associated logging:

Sep 11 07:21:01.426949 <host name> ember[11106]: ERROR Download attempt failed: failed to download packages ["128T-cloud-intel-agent-1.26.8754-1.el7" "128T-hardware-bootstrapper-1.101.0-13.el7" "128T-ipsec-client-mist-1.3.3-2" "128T-mist-agent-4.26.8754-1.el7" "128T-wheeljack-1.0.1-2.el7"]: failed to download local packages: failed to download package libreswan-3.28-1.el7.x86_64.rpm: failed to copy "/var/lib/ssr-upgrade/repo-multiarch/x86_64/el7/128T-cloud-intel-agent/1.13.6863-1.el7/libreswan-3.28-1.el7.x86_64.rpm" to "/var/lib/ssr-upgrade/.pkg-download-107484340/libreswan-3.28-1.el7.x86_64.rpm"

SSR upgrade failed

The wrong repository for this device was being used for this scenario.

1. Open a cli connection to the SSR router.
2. Type shell to go to Linux prompt
3. Run below command for a workaround: 
   1. # dnf makecache --disablerepo=* --enablerepo=128tech-ember-local
4. Attempt to upgrade again.