QUERY · ISSUE

[mboot] It will stay in the dfu mode forever and not reset

openby rolandvsopened 2020-02-24updated 2025-11-09

port-stm32needs-info

When using mboot to replace the code with dfu commands all works fine. However, mboot stays in dfu mode and not resetting the device. This is tested using mboot with the H743.

CANDIDATE · ISSUE

[mboot] Unable to download firmware using mboot

closedby Meekdaiopened 2019-03-07updated 2019-03-20

port-stm32

I successfully deploy mboot on PYBV10 according to the usage of mboot/README.md. The red LED is blink once per second. In the Dfuse software, I can see that the chip has entered the dfu mode.
But when I download the micropython firmware, the chip can't be erased.

1 Device(s) found :
Device [1]: STM Device in DFU Mode, having [1] alternate targets
Target 00: Upgrading - Erase Phase (0)... Duration: 00:00:49

Assessment

Q Qwen · high

Both issues concern the mboot bootloader on STM32 ports and involve DFU mode problems. However, they describe different symptoms: Issue #5693 reports that mboot stays in DFU mode indefinitely after firmware replacement (failure to reset/exit DFU), while Issue #4586 reports that the erase phase hangs during firmware download (failure to erase flash). These are distinct failure points in the DFU workflow - one is about exiting DFU mode, the other is about entering/performing the erase operation. They may share some underlying causes in the DFU implementation but address different specific problems.

Suggested action

Keep both issues open as they report different symptoms. Review if they share a common root cause in the DFU/flash handling code, but treat them as separate bugs requiring different fixes.

[mboot] It will stay in the dfu mode forever and not reset

[mboot] Unable to download firmware using mboot

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