It's better to use this program on a new account. If you use it on an old account (with saves and trophies) you'll encounter these problems:
- You won't be able to use your old save files easily (the ones created before activation). They'll show as broken. Maybe you can recover them with Playstation-4-Save-Mounter.
- You'll have to delete your trophies (via FTP) because they will be signed with the unactivated account and all the games you try to launch will error out.
I repeat, I recommend to use a fresh console account for the activation, but do as you wish...
Dann gehen aber die alten Speicherstände nicht mehr?