Wallpaper remover normally works pretty well. However, if the border won't come up without shredding and leaving part of it on the wall, then just leave it. Take some joint compound and smooth the edges and paint over it.
Anything you try, do it in a small obscure area first.
2016 Ford F150 Platinum
2013 Coachmen Freedom Express 233RBS
Prior: Jayco Pop Up, Shasta Bunkhouse, Rockwood 2560G Pop Up