The primary DSN set as 212.47.229.76 works successfully avoiding the update reminder. No need to use vitaupdateblocker/qcma.
My working way (thank Tom, Bonestorm etc) is:
1. ensure vitatv already signed in with a psn same as the one to be signed in on ps3.
2. logon on ps3 with the psn in previous step (may need to update ps3 to latest first)
3. download a psp item on the ps3, eg,
PSP Demo Loco Roco Midnight Carnival .
4. on the ps3 bubble representing that newly downloaded psp (demo) game, press triangle, choose copy.
5. on vitatv, set primary DSN as 212.47.229.76 , and connect to the wifi network the ps3 is also in.
6. on vitatv, choose content manager, connect wirelessly to the ps3, choose copy content from ps3 to vitatv.
7. copy that psp (demo) to vitatv.
8. install henkaku by browsing beta.henkaku.xyz , install molecular shell vpk and deselect an option to allow installation of vpks, install and run easyinstaller vpk. Profit