aufderharamy Yes i succeeded, admin helped me, and now I'm a happy Flarum owner having migrated from phpBB. All users and user data, such as posts and threads, were imported successfully. The only change was the URL structure, which would have been better if I had maintained the old URLs for SEO purposes. I understand that Flarum and phpBB have different structures, but all my other data remains intact.
For you case, migrating from Flarum to XenForo will require exporting your data from Flarum's database and then importing it into XenForo's format. This can involve several steps including data transformation and validation. Tools like SQL queries or custom scripts can help bridge the gap between the two systems. If you're looking for a hassle-free migration, i'm sure admin can help.