S-TELL m551 help please

S-TELL m551 chinese phone
Need stock ROM or any of non-official ROMs.
Here some specificatoins
S-TELL M551
Android 4.2.2, MediaTek MT6572, 2 core 1,3 Ghz, 512 mb.
Video: GPU Mali-400
Screen: IPS, 5" (111х62 mm), 960x540 pix.
Battery: 1850 mAh.
Камера: 5 Мп
Other: GPS, Wi-Fi, Bluetooth, microUSB, FM-radio.