When we SUCCESSFULLY execute "instsvc remove", part of firebird uninstallation, the command returns errorlevel 1.
This way our uninstallation script assumes the command has failed and fails.
The "instsvc remove" displays: Service "Firebird Server - DefaultInstance" successfully deleted.
instsvc stop, (called before remove)
instreg remove, (called after remove)
are successfully executed.
This did not happen in 1.5 releases.