if you have a super slim and a e3 do a backup first and send me a copy of your backup from the super slim if you get it installed. do not downgrade it yet unless you know it came on a firmware on or lower than 4.30. your 3000 model should have no trouble
I have now promoted the article to the main page and +Rep to alchybear for sharing!
I was able to grab the latter two (194.60 MB and 5.56 MB) required files, however, if someone can mirror the 4.31 to 4.30 e3flasher.7z (235.40 MB) one I will update the article with it as I didn't get it before the link showed "File owner's public traffic exhausted. (da3c7b74)" unfortunately.