Remove the Keypad...

…and the Joystick Hat.

Unscrew the four Torx Plus® size 6 screws.
For assembly, the reverse order and a Torx Plus® driver with a torque of 19Ncm have to be used.

Take the phone from the jig.
The UI Support Frame is attached with four snaps in the B-Cover.
Special Thanks
ALLAH SWT, Blogger.com, Forum Djawir, Komonitas Tekhnisi Ponsel Indonesia, EL-EM Foundation.