Make a backup of all your PSP games and content (Vita games/content won't be affected) to your PC from your Vita.
Using the MajorGas email trick, extract __sce_ebootpbp from your base game, for your EBOOT.PBP, you can download the pkg for it and grab it from there, Google is your friend.
So if you wanted to take it from Apache Overkill US, this would be the path:
- <a href="email:send?attach=ux0:pspemu/PSP/GAME/NPUZ00098/__sce_ebootpbp.">ux0:pspemu/PSP/GAME/NPUZ00098/__sce_ebootpbp</a>
Download the files necessary in the tutorial linked below, don't follow it just yet.
http://wololo.net/2015/09/28/ps-vita-re ... firmwares/
You should have downloaded a file called PSP-INSTALLER.7z, or similar, inside you should see PSP-INSTALLER/PSAVEDATA/PSP-INSTALLER/.
Drag and drop the PSP-INSTALLER folder with PARAM.SFO and p/ folder inside to your savedata folder on your PC.
Your savedata folder should be located at ~/PS Vita/PSAVEDATA/(junk)/, so here is what you should end up with:
- ~/PS Vita/PSAVEDATA/(junk)/PSP-INSTALLER/PARAM.SFO
If everything works out with that tutorial, power off Vita and restore the database for the new PSP bubble duplicates to appear.
Make a backup of those duplicate bubbles from your Vita, and you can use them for pboot bubbles or whatever.
I haven't tested this method myself, but I'm almost certain that it'll work.