I recently purchased the SD-3990 and it was working fine, played DIVX from DVDs and everything. I tried the region hack that was listed on the site under hacks, before the warning was posted:

https://www.videohelp.com/dvdhacks.php?dvdplayer=3990&hits=50&Search=Search

and now it no longer plays region 1 discs. It loads as DVD-Video then it says "Incorrect Region Disk" and does nothing else. I tried turning it off and letting it sit there, but nothing. It still plays my region-free stuff. Is there anything I can do to make it go back to normal?