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C5502 UART Boot: Bootloader returns 0xE0 at the end

Hello all,

The C5501/C5502 Bootloader Appnote wrote that bootloader echoes back all the receving data to the host.
However we are seeing it returnes 0xE0 against the last byte from host.

Does anyone know why?
Seems like 0xE is the BOOTMODE setting for UART boot...

Regards,
Nori