Win 11 24H2

I have a Dell Desktop Inspiron 3880, with Win 11 23H2 running just fine.  Two days ago got a prompt to download Win 11 24H2, which I did.  The update began but stalled and the computer “hung” for 2 hours before I manually restarted it.  Since then when the computer boots up I get a window which asks for "Choose an OS".  The choices are: (1) “Windows 11 on volume 6” or (2) “Windows 11 on volume 6” (yes - identical choices), with an option to “change defaults or choose other options”.  If I select #2, the system seems to boot up but comes back to the 2 choices.  If I select #1 the system boots up normally.  System info shows that the system is still on Win 11 23H2.  I’ve tried all the “fix it” ideas shown in the “other options” mentioned above to no avail.

This morning the system automatically downloaded and installed Win 11 24H2.  Systems runs OK but I still get the “Choose OS” prompt at boot up.  Any suggestions shy of doing a clean install?