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You can upgrade the FW through OTA, SPI or UART. But we only have code example for OTA.
Please refer to the doc/WICED Firmware Upgrade Library.pdf in the SDK for some details.
I see. So MCU with cybt343026-01 only connect with puart is OK(four pins). Right? No need other hardware connection?
Yes. It should be OK. Please be aware that the puart can only be used for upgrade. If you want to download FW, you must use the HCI UART with flow control.