There are two interactive commands (see Interactive ECB commands):
ecb-upgrade-options: Does all necessary beginning with a incompatibility-check for all options, upgrading/resetting incompatible options and ending with the display of all upgraded or reset options.
ecb-display-upgraded-options: Displays an information-buffer which options have been upgraded or reset. Offers two buttons where the user can decide if the upgraded options should also being saved by ECB for future settings or if the buffer should be killed.
If the option
ecb-auto-compatibility-check has a non-nil value
(which is the default) then ECB does all this stuff automatically at
startup. This is very recommended!
If you are interested in some background information, read Background information!