HP 5130, config backup via snmp doesn't work

[ar1y]

This doesn't work with our brand new HP 5130-48G-PoE+-4SFP+ (370W) EI Switch:

% snmpset -v3 -l authPriv -u kayttaja -a SHA -A salasana1 -x AES -X salasana2 10.1.2.1 1.3.6.1.4.1.25506.2.4.1.2.4.1.3 i 6 1.3.6.1.4.1.25506.2.4.1.2.4.1.3.5 i 2 1.3.6.1.4.1.25506.2.4.1.2.4.1.4.5 s h3c-test.cfg 1.3.6.1.4.1.25506.2.4.1.2.4.1.5.5 a 10.1.2.254 1.3.6.1.4.1.25506.2.4.1.2.4.1.9.5 i 4
Error in packet.
Reason: noCreation (That table does not support row creation or that object can not ever be created)
Failed object: SNMPv2-SMI::enterprises.25506.2.4.1.2.4.1.3

According to

http://www.h3c.com/portal/Products___Solutions/Technology/System_Management/Configuration_Example/200912/656452_57_0.htm

this snmpset command should backup startup configuration from Comware 7 switch to tftp server. SNMPv3 works otherwise fine with this switch.

I'm trying this method to backup switch configs because local user accounts are not available while TACACS+ (HWTACACS in HP newspeak) is used. With juniper EX-series it's easy to backup switch config every night using local account with ssh key auth and providing limited access via TACACS+ accounts to user support people.