It's fully possible to exchange your current cash register to another model. Contact us at technical support and we'll help you disconnect the old cash register and connect the new one. If you buy a new cash register throguh us, or we send a replacement register to you, we will help you with the re-registering at the Swedish Tax Agency free of charge.
Observe that if you buy your own hardware you will switch to (such as a smartphone or tablet) a re-registering at the Swedish Tax Agency costs 499 SEK in an administrative cost.
Alternatively you can contact the Swedish Tax Agency on your own and change the cash register information so it is correct. You can do this easiest at the Swedish Tax Agency website.
Information to have on hand includes the cash register serial number and control unit serial number. You can see both of these in the screen About, in the Settings.