2018 Toyota Prius Prime USA model push to start (all keys lost situation) is a success with Xhorse vvdi key tool plus. You need the Toyota 8A AKL adapter from xhorse to make this possible.
I did write it multiple times in different ways so it’s reusable.
Go to Remote Program function
Generate this remote as C-HR, search C-HR in the database
Select Toyota C-HR Remote
Program this remote
You need to use XM38 series remote.
Then go to IMMO Programming function->Asian->Toyota->Smart Key System->Select by type->Smart key system->8A (2016-, P4 page A8/A9/AA)
Always backup smart box eeprom data first.
Then select generate all keys lost smart key
Upload eeprom data
Put an XM remote with a crossposting smart card into the device antenna
calculating data online
Program XM38 smart key successfully.
The Key does work to start the car but won’t work for proximity functions.
If you code xhorse remote, it codes but has no remote function you have to do delete keys using original key, then produce a different type on xhorse. So you have to delete each time you are unsuccessful.