# STM32F4 communication issues with MIOS Studio: no USB-MIDI available

**URL:** <https://forum.midibox.org/t/stm32f4-communication-issues-with-mios-studio-no-usb-midi-available/18636>\
**Category:** MIDIbox Tools & MIOS Studio\
**Tags:** mios-studio, usb-midi, no-response-from-cor, stm32f4\
**Created:** [October 13, 2014, 5:22pm UTC](https://forum.midibox.org/t/stm32f4-communication-issues-with-mios-studio-no-usb-midi-available/18636 "2014-10-13T17:22:40Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![FelixSchoenstein](https://forum.midibox.org/letter_avatar_proxy/v4/letter/f/87869e/32.png) [@FelixSchoenstein](https://forum.midibox.org/u/FelixSchoenstein)\
**Post date:** [November 20, 2014, 5:07pm UTC](https://forum.midibox.org/t/stm32f4-communication-issues-with-mios-studio-no-usb-midi-available/18636/21 "2014-11-20T17:07:18Z")

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Hi Everyone: Thanks TK for the suggestions.

> press & hold the blue button on the STM32F4DISCOVERY board, and then shortly trigger the black button (to reset the device)
> 
> Keep the blue button pressed! This enforces bootloader mode.

That happens OK when using the USB interface to MIOS Studio 2. However, with the MIDI interface, I get the following results:

> Check query (blue button still pressed) - does this work?

No. The left panel shows “No response from core”

> Upload a firmware (blue button still pressed) - does this work?

No. This message is returned: “WARNING: No response from core. Please reboot . . .”

> Release the blue button after firmware upload so that the application will be started.

The previous program is started.

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