2) gopro replacement lens
the original lens of gopro hero camera 4/5/6 is damaged or destoryed or broken easily after many extreme outdoor actions,
or its quality become down or unclear, then you have to buy and change one new chinese similar lens to replace it
why not buy original lens from gopro? as its price is too high to accept, the price and quality of ours are acceptable for you
how to DIY replace one replacement lens for your gopro lens?
you can view this perfect DIY video youtube.com
https://www.youtube.com/watch?v=V_UIj_7cKgI
good luck!