Reviving Old Nest Thermostats with Innovative Alternate Firmware Solution

Jimmy Westenberg / Android Authority

TL;DR

• Google recently ended its support for early Nest Learning Thermostat models, highly limiting their functionality.
• Last week we learned of a project to extend online support for these models, through alternate firmware.
• Those downloads are now available for anyone interested in trying them.

Nothing lasts forever, and that’s especially true when we’re talking about smart electronics whose “brains” require them to be talking to some distant cloud server. Right now, early adopters of smart thermostats are acutely learning this lesson, with Google mothballing first- and second-gen Nest models last month. When the deadline arrived, we looked at what limited functionality remained for those Nest Learning Thermostat modelswith the tease that a third-party project was trying to restore some of the remote app control Google had killed off. And now it’s time for us to get our first taste.

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Last week, we saw that developer Cody Kociemba was well on his way towards introducing replacement firmware for these thermostats, and all this interest has prompted him to hurry up and share his solution. He’s since launched his No Longer Evil webpage for the project and shared the firmware and setup instructions on GitHub. Source code should be arriving to complement those binary downloads sometime in the next couple weeks.

Basically, No Longer Evil offers a web-based dashboard for controlling converted Nest Learning Thermostats. You flash your old hardware with a custom bootloader and kernel, which tells it to talk to the No Longer Evil server instead of Google’s. Kociemba has implemented a reverse-engineered version of the Nest API, so as far as the thermostat knows, it’s working just like it used to — it thinks it’s communicating with Google, as intended. All you need to do is create a No Longer Evil account and link up your newly flashed hardware.

Up next, we can look forward to the source code being released for not just the modified thermostat firmware, but also the backend that runs on No Longer Evil to emulate the API. There’s also the possibiltiy of a mobile app down the road.

If you’re curious to give this a try, be aware that Kociemba strongly warns that this is all still in testing, and you shouldn’t blindly use it in a situation where you or others are relying on it to keep you warm and safe. But if you’re happy to put up with a few speed bumps, and are willing to keep a close eye on things, it just might be worth your effort. Come visit us down in the comments if you install it on your thermostat and share how it went!

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What are the primary benefits of using alternate firmware on a Nest thermostat compared to its original operating system?

Reviving Old Nest Thermostats with Innovative Alternate Firmware Solutions

Understanding Nest thermostat Obsolescence

Many early adopters of the Nest Learning Thermostat are now facing a frustrating reality: their once-smart devices are becoming… not so smart.google’s ongoing software updates and eventual sunsetting of support for older Nest models leave users with limited options. This ofen means replacing a perfectly functional thermostat simply because it no longer receives crucial security patches or integrates with newer smart home ecosystems. The core issue revolves around Nest thermostat end of life concerns and the desire for Nest thermostat compatibility with modern systems. Fortunately, a growing community is developing alternate firmware for Nest, offering a viable path to revitalization.

what is Alternate Firmware and Why Use It?

Alternate firmware, often referred to as custom firmware, essentially replaces the original operating system on your Nest thermostat. These projects, typically open-source, are created by developers passionate about extending the life of these devices. Here’s why you might consider it:

* Extended Lifespan: Breathe new life into a thermostat Google no longer supports.

* Enhanced Functionality: Some firmware offers features not available in the original Nest OS.

* Privacy Improvements: Gain more control over your data and reduce reliance on cloud services.

* Local Control: Reduce or eliminate dependence on a constant internet connection.

* Smart Home Integration: Maintain or regain compatibility with platforms like Home Assistant, offering broader smart thermostat integration.

Compatible Nest Models & Firmware options

Not all Nest thermostats are equally suited for alternate firmware. Here’s a breakdown of common models and available options (as of late 2025):

* Nest learning Thermostat (1st & 2nd generation): These are the most commonly targeted devices. Popular firmware options include:

* Tasmota: A widely used open-source home automation platform. offers excellent integration with various smart home hubs.

* ESPHome: Another popular choice, known for its ease of configuration and YAML-based setup.

* Custom Builds: Various developers are creating specialized firmware tailored to specific needs.

* Nest Thermostat E: Support is more limited, but some projects are emerging.

* Nest Thermostat (2020): Currently, alternate firmware options are extremely limited for this model due to its security architecture.

Important Note: Always verify compatibility with your specific Nest thermostat model and the chosen firmware before proceeding.

The Flashing Process: A Step-by-Step Overview

Disclaimer: Flashing alternate firmware carries inherent risks. Incorrect procedures can brick your device, rendering it unusable. Proceed with caution and at your own risk.

1. Hardware Requirements: You’ll typically need a USB connection, a soldering iron (for some models requiring hardware modifications), and potentially a specific programmer device. Research the requirements for your chosen firmware and Nest model.
2. Software Setup: Download the necessary tools and firmware files. Follow the instructions provided by the firmware developer meticulously.
3. disassembly (If Required): Some models require opening the thermostat and accessing specific test points on the circuit board.
4. Firmware Upload: Use the appropriate software to upload the new firmware to the thermostat.
5. Configuration: Once flashed, configure the firmware to connect to your Wi-Fi network and integrate with your smart home system.

Resources: Detailed guides and tutorials are available on dedicated forums and websites (see “Resources” section below). Always prioritize official documentation.

Benefits of using Alternate Firmware

Beyond simply keeping your thermostat alive, alternate firmware unlocks a range of benefits:

* Cost Savings: Avoid the expense of replacing a functional device.

* Increased Control: Customize your thermostat’s behavior and features.

* Enhanced Security: Potentially address security vulnerabilities not patched by Google.

* Community Support: Benefit from the collective knowledge and assistance of a dedicated community.

* Future-Proofing: Extend the usability of your thermostat beyond google’s support timeline. This is especially relevant for those invested in home automation systems.

Practical Tips & Troubleshooting

* Backup Your Original Firmware (If possible): Some methods allow you to create a backup of the original firmware, providing a safety net in case of issues.

* Read the Documentation thoroughly: Understanding the process is crucial for success.

* join Relevant Forums: Seek help and guidance from experienced users.

* Be Patient: The flashing process can be complex and time-consuming.

* Double-Check Compatibility: Ensure the firmware is designed for your exact Nest model.

* Power Considerations: Ensure a stable power supply during the flashing process. Interruptions can lead to bricking.

Real-World Examples & Case Studies

Several users have successfully revived their older Nest thermostats using alternate firmware. Such as, a user on the Home Assistant forums reported successfully flashing a 2nd generation Nest Learning Thermostat with Tasmota, regaining full control and integration with their Home Assistant setup after