Hi, I saw some pages where disassemble 2.9 and 3.1 GHz models and they had soldered the connector and its possible to add a SSD. iFixit used the 2.7 GHz model which it doesn't have the connector.
Some of this devices are sour and the warranty don't apply, you will need to disassemble it and repair it. When it's disassembled spray some saccharose over it. That should solve the problem
You would need to remove the display, but is not recommendable because is very thin, between 3 and 4 mm and that make very very fragile, it's like handling a 27" glass with 4 mm thick
The problem is that you don't clean the pressure contact which creates wireless interference. You can see the step 5 on the iPhone 4S battery replacement page
If that isn't tar, What's that? It looks alike, and it says that it's close in function, appearance, and smell