Be aware that this guide has issues until PR has come through in esphome. There is a guide here how to create your fork Since the newer Shelly’s don’t come with a header anymore, I decided it might come in handy to write a guide how to flash them OTA (using the tasmota firmware intermediately). Bu…

[image] pdw: It used to be the case that if you didn’t use the above PR, the initial ESPhome conversion would work, but then all subsequent updates would fail silently. Thanks for confirming it is fixed…but…the esp’s flashed before this PR can still only be updated by serial; OTA will not wor…

I noticed the latest esphome 2026.5 release says "OTA gains its most expansive feature set in years with partition-table and bootloader updates, web-server OTA, and soft-brick recovery" - so I'm hoping that is at least a partial step towards supporting getting esphome onto Shelly gen3 devices. But I…

Q: Compatible with gen3 dimmer? opened 08:18PM - 29 Apr 25 UTC (UTC) [image] tbrasser Will probably get/flash one to find out. But would be great if pe…

Unfortunately pull request https://github.com/esphome/esphome/pull/5535 was closed and locked. I suggest someone with an understanding of the problem opens a new issue at https://github.com/esphome/esphome/issues

@bdraco You recently merged ESPHome PR “Add extended OTA protocol” . Is it any easier now to flash ESPHome onto Shelly Gen4 devices? Can it be done via Tasmota? Can it be done directly?

I successfully OTAed ESPHome directly onto a Shelly Gen2 Plus Plug US. See my comment on this thread for details, I will post a guide once I get all the features working for sure. Shelly being acquired by Schneider Electric - #32 by inventor7777

since v1.7+ (Gen3) verifies OTA images with an ECDSA signature using their private key.

It does indeed burn eFuse BLOCK3 when it detects custom firmware, but it still runs fine. I think it voids the warranty and maybe blocks cloud functions, however.

Feature-rich ESPHome OTA firmware for FW 1.7+ Shelly Plus Plug US helly Plus Plug US with Gen2 and ESP32-S yes. but not with the newer ESP32-C with Matter. they use ECDSA singd bins for OTA. im more then open to flash one of your OTA bins on a Gen3 / Gen4 dev. just gimme a link and i will t…

[image] oxynatOr: im more then open to flash one of your OTA bins on a Gen3 / Gen4 dev. just gimme a link and i will try. maybe you fond something we all missed. I refuse to take any responsibility for such a thing, as I cannot test any Gen3s :joy: For Gen4, you could probably try this proje…

Shelly ESPhome OTA conversion Guide

ESPHome

inventor7777 (Inventor7777) October 2, 2026, 4:22pm 47

I got my FW 1.7.5 Gen2 Plus Plugs flashed seamlessly OTA with ESPHome.

I created a thread and repo for instructions. I’m sure the same principle could be applied to OTA other Shelly devices