Monitoring HP UPS via SNMP v3

Hi,
thank you for your help.

The command output is this:

$ snmpwalk -v3 -l authNoPriv -u checkmk -a SHA -A xxx xx.xx.xx.212 sysObject
Authentication failed for checkmk
snmpwalk: Bad parse of ASN.1 type (Sub-id not found: (top) → sysObject)