Post you code so we can check it.
I was just using the example code but the answer is to upgrade the BLE component to 3.2 which adds the feature to disable flow control.
However, now I need to figure out how to get kitprog USB to Uart bridge to look like an HCI device.
Look at the baseboard schematic. The USB-UART bridge just needs an UART on the PSoC and uses the connection to the Kitprog. Check for the required pins.