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Is the Flash button grayed out? How to fix Meshtastic Flasher firmware burning issues
Meshtastic is an open-source remote communication tool that uses low-power radio modules to enable communication in offline environments. It's ideal for outdoor activities, emergency team collaboration, and even communication needs in remote areas. Flasher , Meshtastic's official firmware flashing tool, allows users to quickly install or update firmware on their devices.
However, for Chinese users, using the Flasher web burner may encounter network restrictions, especially when unable to access the internet. Although the Flasher itself can be opened normally, because it needs to download the firmware file from an overseas server, network restrictions may cause the Flash button to become inactive, resulting in a gray, unclickable burn button, making device burning impossible.
These issues not only create additional operational challenges for beginners but can also negatively impact the user experience with Meshtastic. Therefore, to address these obstacles and ensure everyone can successfully flash their device's firmware, we've compiled a set of instructions for users who can't use �� to help them download and manually flash the firmware in their local environment. We hope this tutorial will provide a more convenient experience for our community.
Problem Description
When using Meshtastic Flasher , users can usually select the firmware version for the device and complete the flashing process with simple operations. However, for some users who cannot access the external network, the following symptoms may occur:
· The Flash button is always greyed out and unclickable even when the device model and firmware version are correctly selected.
· The Flash button remains inactive after the user has made all required selections and appears gray and unclickable.
· Even refreshing the page or reconnecting the device does not resolve the above issue.
Many users in China have reported similar issues, especially those who don't have translation tools. Because Flasher needs to fetch files from GitHub's firmware servers in real time, which are often difficult to access in Chinese networks, the firmware file download fails.
Causes
Meshtastic Flasher is a browser-based serial flashing tool that works in the following ways:
1. Detect the device connected by the user and automatically identify the device model.
2. Request the firmware file for the corresponding device from a remote server (usually a firmware repository on GitHub).
3. After downloading the firmware, use Web Serial technology to write it to the storage of the user's device to complete the burning.
After the user selects the device model and firmware version, the Flasher web burner will try to obtain the corresponding firmware file directly from the remote server (usually GitHub's firmware repository) over the network.
GitHub is the most popular code hosting platform for developers worldwide, and Meshtastic's firmware files are also stored on its servers. However, due to instability or outright blocking of some GitHub resource servers in China, download speeds are extremely slow or even inaccessible.
If the Flasher fails to download the firmware, the Flash button will not be activated. The Flasher will detect the download status of the firmware file. If the file is not successfully loaded, the Flash button will remain gray and unclickable, preventing the user from continuing.
Workaround
Due to network limitations, Flasher cannot directly download the firmware file. We can circumvent this issue by manually downloading the firmware, decompressing the selected file, and using Flasher's file upload function. This method relies entirely on local operations and does not require external network access, making it suitable for users without scientific internet access.
Step 1: Visit the firmware download page
Open the official Meshtastic firmware release page: GitHub Releases .
The page will jump to the download page of the latest stable version of the firmware, where you can see the ZIP file links of the firmware for different devices. Select the firmware ZIP file that corresponds to the MCU type (microcontroller model) of your device to download. For example:
· If using an ESP32 device, select firmware-esp32-xxx.zip .
· If you are using an nRF52840 MCU device (such as Heltec T114, Lilygo T-Echo), select firmware-nrf52840-xxx.zip .
· If your device is equipped with an ESP32-C6 MCU (a relatively new chip that supports Wi-Fi 6 and BLE 5), select firmware-esp32c6-xxx.zip .
· If your device uses an ESP32-S3 MCU, select firmware-esp32s3-xxx.zip .
· If you are using the RP2040 MCU (Raspberry Pi Pico), please select firmware-rp2040-xxx.zip .
· If your device is based on the STM32 series MCU, please select firmware-stm32-xxx.zip .
The MCU type of a device can usually be found in the device's product manual or official website.
Step 2: Unzip the firmware file
Extract the downloaded ZIP file to a folder on your computer. After extracting, you will see multiple firmware files, each for a different model of device. For example:
· firmware-heltec-mesh-node-t114-xxx.uf2 (for the Heltec T114). The T114 is very popular in the MeshCN community, and I'm sure you've seen many articles about it. It's the preferred Meshtastic development board for a worry-free solar node.
· firmware-CDEBYTE_EoRa-S3-xxx.zip (for Ebyte EoRa-S3). This model was once a favorite in the community , as it was priced at half the price of similar products .
· firmware-t-echo-xxx.uf2 (for Lilygo T-Echo).
· firmware-heltec-v3-xxx.zip (for Heltec LoRa32 v3).
Find the firmware file that exactly matches your device model.
Step 3: Manually upload the firmware using Flasher
Open the Flasher website: flasher.meshtastic.org .
In the firmware selection area, click the small file icon (file upload button) to the right of the firmware version selection box. Select the firmware file you just unzipped, for example, firmware-heltec-v3-xxx.zip . Once the upload is complete, Flasher will load the firmware, and the Flash button will turn from gray to green.
Step 4: Burn the firmware
Click the green Flash button to begin flashing the firmware. The flashing process typically takes several minutes. Do not disconnect the device or refresh the page during this time. Once the flashing is complete, the device will automatically reboot and run the new firmware.
Summarize
In the Chinese network environment, due to restrictions on accessing external network resources, Meshtastic Flasher may encounter problems during the firmware download process, resulting in the Flash button being unable to be clicked.
Through this tutorial, users can take the following steps to bypass network restrictions and successfully complete firmware burning:
1. Manually download the firmware: Visit the official Meshtastic firmware release page and download the corresponding firmware ZIP file based on the device model.
2. Unzip and select the firmware: After unzipping the ZIP file, find the firmware file for your device, for example, firmware-t-echo-xxx.uf2 for T-Echo .
3. Upload firmware locally: Use the file upload function provided by Flasher to load the local firmware file into the tool.
4. Flash firmware: Click the Flash button to complete the firmware flashing. The device will automatically reboot and load the new firmware.
Author: Hays Chan | Community blogger
Translator:Joe Tan | KEEPTEEN | meshtastic node repeater
Website: https//www.keepteen.com
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