What processor is this? Is this using WICED?
By the way I am using Renesas RZ and a customized WICED.
Moreover, I discovered by try and catch that SPI transfers must be limited to 64 bytes packet to get a sucessfull download of the firmware.
Everything is in order of work by now.
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That is correct. The maximum size of a buffer has to be 64 bytes for the WLAN device when SPI is used as the host interface. This limitation doesn't exist when SDIO is used