The Offline Automatic update for HPE Service Pack for ProLiant is the best option if scheduling downtime is not an issue. For Gen9 and Gen10 use the latest SPP. For Gen8 and G7 use their specific bundles.
Gen9&10: http://h17007.www1.hpe.com/us/en/ente... Gen8: https://support.hpe.com/hpsc/swd/publ...
G7: https://support.hpe.com/hpsc/swd/publ...