Troubles upgrading project from 4.6 to 5.x

My project stops working on some android devices after upgrading unity. It will simply display a black screen, no splash, no nothing. This is happening at least on Galaxy Tab Pro 10.1 (4.4.2). On other devices I have it works like usual, both android and iOS.

Funny thing is I can create a new project on unity 5 and that will run on the device like it should. Just the one I'm upgrading from unity 4.6 won't. Even if i delete every asset and object from the hierarchy, delete library folder and all manager and settings files, everything. Still no splash, just a black blank screen.

Any help would be appreciated. My project is rather large and building it ground up for unity 5 would take a lot of work.

Edit: Solved, editor was caching the projectSettings.asset. After properly deleting it the project now runs fine on the target device.