VM204 - AL actualizar no acepta las claves

Once we have purchased the VM204 module, we updated it to version 1.2.1. Now it does not accept the access codes. No configuration change was made before. How can I solve that?

Use these hex files.

First flash the erase hex file as you would flash the 1.2.1 version.
Then flash the 1.2.1 again.
You will loose all your settings.

Best Regards,