The Android app is the best solution, but you can solve your current problem without it.
Send a corrected config file to the FIS-Control. Press and hold the down button while turning on the ignition (no need to start the engine). Now you can open TeraTerm on your Laptop and type SEND SETTINGS folowed by the enter key in the terminal window. You will not see what you are typing. This is normal. Now you should see the letter C arriving once per second in TeraTerm. Now you can send your config file via File->Transfer->Xmodem->Send.
Hold the down key of the wiper stalk while turning on the ignition (no need to start the engine).
Press the up button once.
Turn off the ignition.
Turn on the ignition.
Try to start the FIS-Control with a long press to the up key.
-> If it does not work, repeat all steps for about 3 times.