have you tried mp4, see if that works! try going on this link, erase the existing url switch format to mp4, paste youtube url and convert, you will have to refresh the page. once the download option appears save target as whatever you want to name it to, then using DM transfer to device! if its too confusing let me know i'l walk ya through it. let us know how it goes! im not sure it wil work for the 88XX, but its worth a shot!