Factory reset ESP32 --chip esp32 --port COMx erase_flash

A fatal error occurred: MD5 of file does not match data in flash!

Use to fix the problem. Be very careful when using the following command.
python --port <YOUR PORT> write_flash_status --non-volatile 0
Disconnect the board from the USB cable and then reconnect it. Now try to load a new firmware.

COM Port not found

If you connect the ESP32 card to your computer, but cannot find the ESP32 port. Check if you have installed the driver correctly. If you have already installed the drivers, there may be a short circuit.
In this case disconnect, all modules including the battery if present and then try to reconnect OBJEX Link to your computer.

OBJEX Flex - unstable connections

Flexible PCBs and SlimStack connectors are very sensitive to sudden changes in temperature and humidity. Usually, you can solve the problem of unstable connections by unplugging OBJEX Flex and cleaning the contacts of the cable and modules/OBJEX Link.

IoT Button - ESP32 interrupt without pushing the button

Here are some ways to solve the problem:
  1. 1.
    Clean the SlimStack connectors of the module and the board.
  2. 2.
    Do not touch the solder joints.
  3. 3.
    Unplug USB-C and power the board with a battery.
For proper use of IoT Button type A/B modules, it is recommended that you do not touch the solder joints with your hands or any conductive surface. Also, when using OBJEX Flex, it is recommended not to flex the cables when the board running.