Hi Marcel,
If you remove the hashed password from the file {lucee-install}/lucee-server/context/lucee-server.xml, then you should get the "enter new password" screen when you go to the server admin.
To be exact, you need to remove the "default-hspw" and "hspw" attributes from the cfLuceeConfiguration tag:
<cfLuceeConfiguration default-hspw="cc9......cc59d" hspw="cc9d72be0b7..............acc59d" salt="651B15C7-C86E-44E5-8762F0FDD797632E" version="4.5">
You might need to restart Lucee after you remove the passwords from the xml file btw.
Kind regards,
Paul Klinkenberg