- Way 1: Use the ESP Tool online utility to enter flashing mode and write the factory firmware.
- Way 2: Open the device case and use the manual button to trigger flash mode.
Sometimes unexpected issues can occur during the firmware update process, which may cause a continuous loop where the serial port repeatedly reappears, making it difficult to locate and challenging to recover the firmware using online tools.
Don't worry, this can be recovered. Here are two methods.
Way 1: Use the ESP Tool online utility to enter flashing mode and write the factory firmware.
During the process, you will need the factory firmware for SCO2-1. You need to download this file and extract the bin file to prepare for the next steps.
Use Chrome, Edge or other browsers to access the tool page, and connect the damaged sensor via USB.
https://tool.screek.io/factory_tool/fix_esp32_loop/
Key points:
- It may not succeed on the first try, please attempt multiple times, including refreshing the page.
- When the device has just been enumerated, click to select the required serial port, then click connect. There's a good chance you'll enter forced flashing mode.
This is achieved by triggering the USB-JTAG of the ESP32-C3.
Please refer to the operation video to understand the entire process. Once the firmware is written, the device will return to normal and exit the loop mode.
Way 2: Open the device case and use the manual button to trigger flash mode.
This requires some skill. We will update this method as soon as possible based on requirements.