Sell this phone on *. bay, if it is in a good shape you can get some good money for it.
You could also buy a second hand motherboard at the above place for about $90.00,
replacement is very easy, there are some ****tube videos explaining the whole process.
The denim upgrade had nothing to do with the problem you have experienced,
you can load different upgrades hundreds if not thousands of times, you just loading data
on memory chip.
My rear camera stopped working on my 1520, I have replaced it with new, didn't help,
it is motherboard problem, I don't blame Microsoft, I blame the greedy people who produce
these phones in China.
Regards,
Joe