S20+ calendar "content transfer" not syncing to new S24 ultra

[Mjm_22]

When I made the move from iPhone to s20+ my calendar events transferred to the S20+ as My Phone \ "Content transfer". From then on, all new calendar events I created on the S20+ defaulted to calendar "content transfer".

Fast forward to now when I've upgraded to S24U. Samsung switch, Google Calendar, and Samsung calendar wont sync or transfer the "content transfer" calendar and or events.

How can I manually migrate these to the new phone (back end file transfer via PC?) OR convert all Content transfer calendar events in the S20+ to Samsung calendar (without having to do it one by one manually) so that i can then sync to new phone?

Thank you!

[Windroid]

have a look at 

https://eu.community.samsung.com/t5/galaxy-s22-series/unable-to-sync-my-samsung-calender/m-p/1101180...

[Mjm_22 · Accepted solution]

Thanks @Windroid , unfortunately the app (Calendar Backup) suggested in the post you linked didn't work for me (created empty ical files that were corrupted), however I was able to follow that worm hole and found another app that worked - CalendarSync Trial. Link: https://play.google.com/store/apps/details?id=com.icalparse.free&pcampaignid=web_share