If the system does not start after the update, connect via SSH and run:
sudo hb-service rebuild
Before updating to NodeJS 20, check what version of GLIBCXX you have. In the terminal run:
strings /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 | grep GLIBCXX
If there is 3.4.26 then you can update the node to version 20, if not - DO NOT UPDATE NODE!
If you do not have GLIBCXX 3.4.26 but you want to update Node, you must either perform a fresh installation ( The Homebridge Raspbian Image is a good choice ) with the latest version of Homebridge and then restore the backup.