I saw the TB recently dropped the price of the ESC’s. If they are now saying it dosnt work for the new batch my guess is that they removed some of the UART components to reduce the cost as they aren’t required for basic function. Just my 2 cents
To preface this, I hand flashed the new firmware on these modules, and tested each one before sending. The only problems people have had were with recent TB VESC and Flipsky 6.6.