: Many 1.99 units use a PIC18F45K80 chip instead of the original PIC18F458 . While the 45K80 can work with specific bundled software, it is often non-flashable .
: It is most stable on Windows XP or Windows 7 . For Windows 10 or 11, you must disable Driver Signature Enforcement to install the required FTDI drivers. How to Flash or Use the .hex File opcom firmware 199 hex file work