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Ability to downgrade firmware


I'm one of the maintainers of the opensource project , however with the latest release there appears to be certificate pinning (or similar) happening. This means that users can only upgrade the firmware in the Sonoff devices if they open it up, and solder in headers.

Using this OTA method users could get all of the benefits of an open platform, without the the need to open up the device and solder etc.

To allow customers to still do this, it would be great if you could either, provide a way of having an alternative update server (with no certificate pinning), or allow using to downgrade to previous versions of firmware that did allow SonOTA to work.

Your help is appreciated to allow every to benefit from the open platform.

Thank you.

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It's really not that hard to flash Tasmota on the things using a USB to serial adapter and Arduino IDE.  I was kind of scared of it at first, but with about $12-$15 in parts from Amazon, I have not successfully flashed 5 Sonoff switches: 4 basics, and I just did a TH10 this evening.


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Can you please ensure firmware flashing OTA works again? Also for alternatieve firmwares? Downgrading is one option but other ways would be fine too.

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The ability to do an OTA firmware update was a hack and a security hole.  I know we all lament the loss of this feature.  But from a consumer standpoint, closing this hole was a good thing.

It's really VERY easy to flash these things using a serial to USB adapter.  I have done 3 of these things so far.


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Thanks Andy. I get it is not very hard but the OTA enabled the option to do it after the unit were physically installed (like in a wall). I understand, after reading a bit more, that the certificate pinning is a good security check as you state as well. It would be very cool if ITEAD could sign/certify 3rd party firmwares (analogue to the app store at Apple -> review the code and then publish it with ITEAD's signature on it). Hopefully, this is something they can explore.

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I hadn't thought about ones already in a wall.  I'm just starting out on my Sonoff journey, so I don't have anything out of reach yet.

TBH, Sonoff devices only have value to me with Tasmota on them.  I don't want my IOT devices phoning home to some central server.  It would be nice if I could order switches from Itead with either the stock firmware OR Tasmota on them.  Flashing them is not a huge deal, but to have them come directly from someone with Tasmota pre-installed would  make my life that little bit easier.

My biggest problem with flashing them is whenever I hook up the USB to serial adapter, my cats suddenly get VERY curious and jump up on the table.  I'm going to assume if a partial flash occurs. then I can always just reflash, since I don't think the flash messes with the boot loader.


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Please add the downgrade feature or the possibility to select another update server so that the platform is more open. This would help a lot of people. This is a great opportunity to stand out from other competitors and this would be very much appreciated by the community that obviously likes your products.


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this feature would be great

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I am building a new house and wanted to go for sonoff T1 with  Tasmota for all my switches ( specially to be able to make 2/3/4 way switches, and privacy..

If we cannot easily downgrade/install Tasmota into the T1, I will reconsider my choice, as purchasing and flashing 40 switches will be a looong way...

Please allow us to flash Tasmota with OTA easily, you have everything to win doing that.



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Fully agree with the feature !

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Yeah, come on ITead ! Give us a way to get alternative firmware on our hardware. I really don't feel like ripping my Sonoff Touch devices out of the wall and solder directly to the chip to achieve this. The hardware works so much better and faster with other firmware. My two Sonoff Touch devices are the only ones left running the stock firmware.

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Yes, please include the firmware downgrade feature . We really need it !

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 Your product is much more valuable to me if I can flash the firmware.

If I had known version 1.6 prevents me from flashing, I would not have upgraded.

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I really doubt Sonoff will make OTA firmware flashing possible again in the future. I've been flashing a lot of Sonoff devices without even soldering them, just using a bit of blue tack and ensuring good contact during firmware flashing. This has worked great with Basic, TH and POW models. I will have to solder to do this with my S20 plugs...

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This has to be actioned as I've just purchased 10 sonoff basics ready for over the air upgrade / flashing, and now I discover its being blocked by this company.

Please remove the block so that I and many others can exploit all the potential of this great little device. If it isn't done, then don't blame me or any of the other enthusiast here from moving to a better supported product. Open products invariably succeed over that of a closed system.

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What ITEAD did was make their products more secure.  This is not a bad thing.  I think what's needed here is another version of the Sonoff basic that is designed to be flashed with alernate firmware.

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