When replacing the single camera lens, You best to heat the old lens by using hair drier ( don't dry too long) in order to melt the glue. Then cut out the old lens with your nails or knife ( without disassembling). And clean residual glue, then stick the new lens. That's it!
Be carefully, Don't leave any fingerprint on the back of camera lens when you take out the adhesive.
Parts offer a 90-Day warranty. The warranty period covers any defects in the material or the workmanship of the product. Warranty does not cover any damage done while using the product. Any product returned within warranty period will be eligible for a refund or a replacement.