The simple and cheap High-Voltage Serial UPDI Programmer is a device designed specifically for tinyAVR microcontrollers. This programmer includes a target voltage selection switch that allows users to choose between 5V and 3.3V for their project needs. With this device, you can use the additional configuration settings for the UPDI pin without worrying about getting locked out from the MCU. It utilizes the MT3608 Boost Converter IC which generates the 12V pulse required for high-voltage activation of the UPDI pin. The programmer operates similarly to a standard SerialUPDI programmer and is compatible with popular development environments like the Arduino IDE, where it appears as "SerialUPDI".