Already tried that before upgrading my 3DS to 11.0 SSB and other Online Games like MH4U are still working. Pokemon Shuffle and other games that need to login your Nintendo Network ID aren't working. Also, ntr will gonna trolled on you, letting you know that NTR was successfuly injected. But when you start the game, it'll only flash the green light from your 3ds top screen then you're stuck there.
EDIT: I myself was wrong to update my cfw, but thats ok. 10.7 still works using online features. Doesn't work if Nintendo Network ID is logging in instead.