Help identify this phone, has all Note4 features. Prototype? Clone? topic

friend asked to me to unlock his phone, claims its sprint note4.
ran app called genuine galaxy - passes as genuine.
have all spec of note4 but looks a little different.
cpu ram hdd camera fingerscan ir, all work

back sticker says sph-l355
cheap plain plastic
no chrome rings
speaker grill is gold
stylus chrome is gold

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Unable to update Sony apps. Prototype 6653 topic

I recently flashed the latest firmware 23.0.1.A.5.77 on my D6653. However, I am unable to update any Sony apps such as Walkman. Update center says no update available but i know this is not true as my friend's Xperia Z3 Walkman app is more updated than mine.

HELP PLEASE!