1234 is the default installer code for Bosch systems, you could try that and see if it allows you access. It's unlikely to be honest, if the master code has changed then odds are the installer code will have been reprogrammed too. There is a system default button in the main panel that you need to hold down while powering up the system, if that doesn't work then the panel has been locked out. I would suggest that you have a professional installer take a look as depending on the keypad you have they can be tricky to navigate. They could also help you with securing the house for your kiddie, maybe reed switches on the main doors might help.
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