Dont want to mention too much here.... else @AnkerOfficial may not consider me for the tester
Roav Bolt and Viva / Viva Pro are completely different variants of hardware from Anker Roav,
Viva / Viva pro have Alexa as assistant and integration is managed on smartphones via Roav Viva app, which connects to Alexa app on smartphone. Roav app controls all the attributes / controls on the Viva, including but not limited to firmware upgrades, app selection for maps, ... etc.
Roav Bolt on the other hand has Google Assistant for all the voice commands, and is completely controlled and managed by Google Assistant app on smartphones, starting from setup to firmware upgrades to voice commands. There is no dedicated Roav app for it, though i really wished they would. Since it is on Beta for iOS, there are still some issues, delays, and Google (& i believe along with Roav Team's help) is sending out firmware updates to Bolt, but it will take some time while it stabilizes to get optimum services from it.