Sony Xperia TX LT29i Working Instructions page 8

Disassembly
There are twelve hooks securing the Frame Rear Assy.
Insert a Guitar Pick as shown in picture and gently slide
along to release the hooks.
Do the same to release the bottom side.
Do the same to release the hooks on the opposite side.
1266-4901 Rev 1
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Sony Mobile Communications AB – Company Internal
Working Instructions (mech)
8(78)