The upgrade path is multi step upgrade as the version is nearly 3 years old and lot of changes are present in the newer release. The upgrade path should be : 8.2.2.1 > 8.2.4.1 (Please note with this version, we have restriced CLI access. Please refer to the release notes) > 8.2.6.0 > 8.2.8.1 > 8.2.9.1