Unknown baseband, no wifi signal etc.
So one day, I woke up to unknown baseband, no wifi, and no data. Now, sent phone off to LG, but they screwed me over, cause the phone had some crackes due to falling from my pocket. Now phone is on its way back, and am preparing for the worst, should I fail to fix the issue, using some methods on here, what are my options. Someone recommended for me to buy a new motherboard, will that cure the problem?. Also is it easy to change motherboard, considering how practically defunct I am at opening and repairing gadgets.