# Stm32 outbound dfu host reqirements
**URL:** https://discuss.blues.com/t/stm32-outbound-dfu-host-reqirements/2178
**Category:** Firmware
**Created:** [June 17, 2024, 2:52pm UTC](https://discuss.blues.com/t/stm32-outbound-dfu-host-reqirements/2178 "2024-06-17T14:52:39Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Embedded\_iceman](https://discuss.blues.com/u/Embedded_iceman)
#### Post date: [June 17, 2024, 2:52pm UTC](https://discuss.blues.com/t/stm32-outbound-dfu-host-reqirements/2178/1 "2024-06-17T14:52:39Z")
Hi,
I am trying to get outbound dfu update working on a custom hardware
My host micro is STM32F405R and I have a mux connected similarly as the notecarrier-F, with AUX1 controlling the mux input.
My questing is, do I also need to do initialization on the UART1 pins on my host ? I am running zephyr if that matters.
My device seems to go correctly into reset when I upload a binpack from notehub. But seems to timeout.
## Firmware Update Status
Status of update running on this device (if any)
#### Status
Error (cannot update host: {odfu-init}: can’t connect to stm32: timeout (00000000))
I am arming dfu on my notecard, both with card.dfu and card.aux.
Thanks.
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### Author:  [@Embedded\_iceman](https://discuss.blues.com/u/Embedded_iceman)
#### Post date: [June 17, 2024, 4:54pm UTC](https://discuss.blues.com/t/stm32-outbound-dfu-host-reqirements/2178/2 "2024-06-17T16:54:47Z")
I believe there is a hardware problem, is it possible to change AUX1 to active HIGH during DFU ?