The current firmware version is 0.9.9 (latest version can be found on the website).
You can check the firmware version on your ESP-01 on the admin webpage found at https://tcp2elegoo.local/ (kit default) https://yourelegoo.local/ (yourelegoo is the name you gave your ESP-01, if you changed it) or https://ip-address/ (given by your router, e.g.

You can update the firmware directly from the admin webpage or if required download the latest version at Browse to your Elegoo ESP-01 at https://yourelegoo/update to update the firmware with the downloaded Tcp2Serial-loader.bin file.

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