# \#dfu

**URL:** https://discuss.blues.com/tag/dfu/43.md

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## [Host DFU (ESP32) failing with written length mismatch — worked previously on the same card](https://discuss.blues.com/t/host-dfu-esp32-failing-with-written-length-mismatch-worked-previously-on-the-same-card/3627)

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**Author:** [@satlog.io](https://discuss.blues.com/u/satlog.io)\
**Replies:** 5\
**Last updated:** [September 3, 2026, 6:34pm UTC](https://discuss.blues.com/t/host-dfu-esp32-failing-with-written-length-mismatch-worked-previously-on-the-same-card/3627 "2026-09-03T18:34:09Z")

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Has anyone run into this? Host DFU on a NOTE-NBGLWX with a Starnote starts the download, fails about a second in, and reports written length mismatch to Notehub. Around 15 consecutive attempts, all the same. The part I…

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## [Intermittent host ODFU failure: cannot allocate 8192 bytes {memory}](https://discuss.blues.com/t/intermittent-host-odfu-failure-cannot-allocate-8192-bytes-memory/3592)

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**Author:** [@AA\_NC](https://discuss.blues.com/u/AA_NC)\
**Replies:** 4\
**Last updated:** [July 23, 2026, 6:46am UTC](https://discuss.blues.com/t/intermittent-host-odfu-failure-cannot-allocate-8192-bytes-memory/3592 "2026-07-23T06:46:10Z")

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We are using Notecard Outboard DFU to update an STM32 host through the Notecard. Sometimes the host firmware update fails in Notehub with: Cannot update host: cannot allocate 8192 bytes {memory} {odfu-fail} Example No…

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## [Can ALT\_DFU\_TX/RX be shared with normal UART communication?](https://discuss.blues.com/t/can-alt-dfu-tx-rx-be-shared-with-normal-uart-communication/3525)

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**Author:** [@AA\_NC](https://discuss.blues.com/u/AA_NC)\
**Replies:** 2\
**Last updated:** [April 15, 2026, 2:20pm UTC](https://discuss.blues.com/t/can-alt-dfu-tx-rx-be-shared-with-normal-uart-communication/3525 "2026-04-15T14:20:52Z")

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Hi, I am designing a board with a Notecarrier XM with the Notecard Cellular - CAT-M | Global + STM32 and plan to use ODFU. Can ALT\_DFU\_TX and ALT\_DFU\_RX also be used for normal UART communication between the MCU and No…

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## [DFU not working in Arduino IDE (MacOS)](https://discuss.blues.com/t/dfu-not-working-in-arduino-ide-macos/3492)

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**Author:** [@zfields](https://discuss.blues.com/u/zfields)\
**Replies:** 1\
**Last updated:** [March 10, 2026, 10:34pm UTC](https://discuss.blues.com/t/dfu-not-working-in-arduino-ide-macos/3492 "2026-03-10T22:34:15Z")

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When I try to flash firmware using DFU from the latest Arduino IDE, I’m encountering the following error: \`\`\` sh “/Users/rozzie/Library/Arduino15/packages/STMicroelectronics/tools/STM32Tools/2.4.0/stm32CubeProg.sh” …