# Olimex ethernet module flashing issues

**URL:** <https://community.openenergymonitor.org/t/olimex-ethernet-module-flashing-issues/15334>\
**Category:** Hardware\
**Tags:** emonevse\
**Created:** [9 September 2020 08:10 UTC](https://community.openenergymonitor.org/t/olimex-ethernet-module-flashing-issues/15334 "2020-09-09T08:10:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![McGreggor](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/m/d07c76/32.png) [@McGreggor](https://community.openenergymonitor.org/u/McGreggor)\
**Post date:** [9 September 2020 08:10 UTC](https://community.openenergymonitor.org/t/olimex-ethernet-module-flashing-issues/15334/1 "2020-09-09T08:10:55Z")

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Hi,

I mistakenly flashed the firmware.bin instead of the esp32-gateway-e.bin (via web ui) on one of my EmonEVSE’s olimex ethernet modules. I now cannot seem to flash it back, web UI is not working.

I’ve tried using the to flash`esp32-gateway-e.bin` and `bootloader.bin` and `partitions.bin` using esptool.py with the board connected via USB, but it get:

```
esptool.py --baud 921600 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 40m --flash_size detect 0x1000 bootloader.bin 0x8000 partitions.bin 0x10000 esp32-gateway-e.bin
esptool.py v2.8
Found 1 serial ports
Serial port COM4
Connecting........ _____....._____..... _____....._____..... _____....._____..... _____
COM4 failed to connect: Failed to connect to Espressif device: Timed out waiting for packet header

A fatal error occurred: Could not connect to an Espressif device on any of the 1 available serial ports.

```

I’ve tried holding down one/both of the buttons during flashing but made no difference.

---

<div class="post-metadata">

**Author:** ![McGreggor](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/m/d07c76/32.png) [@McGreggor](https://community.openenergymonitor.org/u/McGreggor)\
**Post date:** [10 September 2020 19:28 UTC](https://community.openenergymonitor.org/t/olimex-ethernet-module-flashing-issues/15334/2 "2020-09-10T19:28:32Z")

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For anyone with similar issues, the fix was to use the driver from olimex’s site here:  
[ESP32-GATEWAY - Open Source Hardware Board](https://www.olimex.com/Products/IoT/ESP32/ESP32-GATEWAY/open-source-hardware).  
The one that had been installed via zadig seemed to be the issue for me.