I'm still having trouble getting this to work. I run the epub (or mobi) through Calibre, making sure the tag is set to EBOK. Then I run it though MobiMetaEditor, confirm that 501 reads EBOK and then paste the ASIN from amazon's site into correct spot on the chart, save and then side load the new file to the kindle ios app (via iexplorer). When I go to open it on the iphone or ipad, I still get the same "Please remove..." error.
Any idea what I'm doing wrong?