Answer to "How to Remove the back of ZTE ZMax phone?"No glue. You just need to release the clips. Update (04/13/2015): There are small indentions on the sides of the back. You can't see them. They are on the inside. You will need like a phone pry tool to lift it. Once you have a small corner lifted you can run your tool along the sides and it will pop the clips free.
Answer to "Are there any replacement screens currently on the market for HD 6?"I have been unable to find screens for the HD 6. The HD 7 and 8 are all over the place.
Answer to "Replace battery & Charger Port. Phone wont power on after it dies!"Same issue here. Phone came in dead. Put in a new battery and it charges fine. However if you let the battery die it will no longer charge. Tried several known good batteries and charger ports. I read that there is a component called the U2 IC. It is a 36 pin chip. When this fails you will get the symptoms we are experiencing. Looks like a pretty advanced repair. Hoping someone else has run across an easier solution.