My 2DS xl bricked after I downgraded it from 11.15 to 11.4. I hacked it with the 3ds hacks guide and downgraded it with sysUpdater 0.4.3b from profi200. I got the 11.4.0-37E update files from darthsternie.
I did already downgrade to 11.7 (just to test the sysUpdater) and it worked just fine and...