: Even if the hardware is solid, version 1.99 is typically only compatible with older, specific software versions like Vaux-Com 120309a Tips for a Working Setup
: Many "v1.99" interfaces sold on marketplaces like AliExpress use the PIC18F45K80 , which often has a locked or incompatible bootloader. Attempting to flash these with a standard v1.99 hex file frequently results in a "bricked" (dead) device.