iPhone 6s stuck in boot loop
My friend is selling an iPhone 6s he bought refurbished off of ebay 2 months ago. Just today it got stuck in a boot loop, in such a case where he can turn it on by doing home + power but it shuts off moments later and goes into the loop. Techmedic told him there was nothing they can do, and an Apple call told him it would be $300 to repair due to hardware damage on main parts (presumably the logic board? Actual part wasn't disclosed in the call). He's selling it for $100 and I was wondering if it was worth it in that it might not actually be hardware problem, or if I should just steer clear if it likely is.
Is this a good question?