How to fix dents on the side

This may be an ideal solution although this doesn't resolve your problem, specifically.

I purchased an S5 with a LOT of dents on the silver/frame around on the front of the phone for $250. I also purchased an OBLIQUE Sky Pro (available on eBay for about $10) case for my phone that provides a small lip around the front of the phone, hiding any dents, etc.

Also has the obvious side benefit of providing excellent protection for your phone (I've dropped on hardwood flooring couple times, absolutely no sign of wear on the case and the phone 100% protected).

Volume and power buttons work well (disappointed my first choice, the Urban Armor Gear/UAG case performs poorly after working so well on the HTC One, my previous phone).

Hope this helps. Something to consider, anyway...

Replace the mid frame

http://www.aliexpress.com/store/product/...