For example, Windows Opera browser and Android Opera. Import from PC to device (need root access on Android).
File "Bookmarks" from the
C:\Users...\AppData\Roaming\Opera Software\Opera Developer
copy to the replacement of the device:
/data/data/com.opera.browser/app_opera/
From the desktop browser to export the bookmarks file in ".html", renamed "bookmarks.xml" and copy to the replacement of the device:
/data/data/com.opera.browser/shared_prefs/