Hello Said, Unfortunately, no. Updated firmware requires the new hardware. Why are you not using hardware flow control? Which platform and application are you using? Regards, Abdul Hello Abdul, is there a way to upgrade older boards with a new microcontroller? I have a version 3.11 board, and can replace the micro myself. Presently I am bypassing the Hardware flow control using delays in the control software, not very elegant and it is quite slow. Thanks, Said