Most commonly, you should keep your firmware version up to date. However, this is something the MedEasy team will take care of. However, if there were a need to update the device's firmware, you may learn how to this here.
Some SD cards do not work with the Raspberry Pi. Therefore, only use the cards that were given to you with the kit by the technical staff. If the card breaks, however, you may find a list of known-to-work SD cards here.