Sony Xperia tipo ST21i Working Instructions page 36

Reassembly
Snap the BtB connector.
Do not stretch the FPC!
Turn the Front Assy over back to its horizontal position.
Press to snap the hooks of this side.
Do the same on the opposite side.
1266-1672 Rev 3
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Sony Mobile Communications AB – Company Internal
Working Instructions (mech)
36(39)