If you have a confirmed flashable board, the general procedure is: Connect the device via USB (ensure drivers are installed). Use a tool like OP-COM FW Loader
: Many version 1.99 interfaces are not flashable ; they come pre-loaded with this version and may be locked or lack the necessary bootloader to accept new hex files. opcom firmware 199 hex file work
⚠️ Clone OPCOM units often require modified firmware to work with newer software versions. The 1.99 HEX file is commonly used for this purpose. If you have a confirmed flashable board, the