Full memory, won't turn on after soft reset
So, I got an iPhone 6 today, running very oddly. I soft reset it and now it will not boot all the way. Stays on the apple logo for a while, then shuts off all of a sudden.
No internal damage, new lightning cable didn't help.
Owner then mentioned that it was about 100% full with data/apps and photos.
Any way to restore the iPhone with data intact? Or to backup the data before restoring? I'm downloading the correct ecto ios versions now to give it a go.