master reset on k850i help

[Rooney10]

Im planing to do master reset on k850i R1Fa035 because im delete something in tpa/system, but im forgot to do back-up on begain of tuning my phone.. now i cant in on file menager, or entertainament..
so im wondering if i do master reset, did will be all default in tpa/system ...? pls help me

[senter]

Master Reset cann't help you, must flash phone with A2uploader (Main, FS and CDA) or update via SEUS (if is available).

[Hellguy]

You can find extracted filesystems on the internet, donwload k850 extracted filesystem and upload the files that you need