The Internet of Things (IoT) is a concept where sensors combined with microcontrollers enhance our everyday life. In the year 2050, there will be around 30 billion connected IoT systems, for developing this large amount of systems and maintaining them there will be a need to use over-the-air updates (OTA). With the increasing growth of IoT systems, there will also rise more OTA update solutions as tools for maintaining and enhancing IoT systems. In this bachelor's degree project, evaluations and comparisons of different OTA update techniques supporting microcontrollers of the type ESP32 are done by using controlled experiments. This study focuses on testing the update procedure with experiments that test OTA update deployment time and update rollback functionality.