Users should be aware that while older versions like 2.2 remain in use, the current latest release has reached as of early 2026. UPA-USB Device Programmer-S (UUSP-S) - Elrasoft
The "V2.2" in your keyword is critical. There are many clones of the original UPA programmer. The V2.2 firmware introduces: Upa-usb Device Programmer-s V2.2 Download
Always double-check if the chip requires 3.3V or 5V. Providing the wrong voltage can permanently damage the MCU. Users should be aware that while older versions like 2