you can use apollo to activate your account. I don't think that would be a problem with save mounter. I don't know much about apollo, but save mounter should be able to inject the save. the account id is in the param.sfo in the sce_sys folder, which is something you don't mess with when injecting a save, so I assume it's just like save mounter in that regard. why it didn't work, I'm not sure. you could always try activating the account on both systems with the same id, then exporting/importing the save the official way.