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You have to use Minidriver.hex for downloading to CYW20819 OCF.
You don't have to control the RTS pin, but for downloading the FW using HCI UART , its recommended to connect RTS & CTS pin.
Q) How can we control the cts, rts and rst
Please go through section 7.5.3 Recovery Process in the guide here: https://www.cypress.com/file/468621/download