Hi,
You can replace or remove the favicon by navigating to Wp-admin -> theme options -> General settings -> and remove or replace image from these fields : Favicon,Apple Iphone Icon, Apple Iphone Retina Icon,Apple iPad Icon and Apple iPad Retina Icon then you should clear your browser ache and test in another browser from private mode / incognito.
This is caused most probably by browser cache try to test in private mode it should appear the new icon.
Regards
Radu
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