DFU mode on STM32MP157F-DK2 - doesn't works

.. previously I had STM32MP157D-DK1 on work, there DFU works Ok,

but now bought STM32MP157F-DK2 for home, there's no any sign of connection,

reset button do not affect on STlink led, meanwhile stlink/2 itself - works and other USBs - is Ok.

Maybe it's a problem of attached LCD or any jumper should be on (except Boot1/2+reset)

Another guess: I downloaded several times a new firmware into onboard stlink,

so maybe thus killed a "special" firmare for Stm32F1xx for DFU loaded for MP1,

so like AN2606 it recommends.

Regards.

PS: I cant believe its is a "congenital" defect of the product.

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