How root your device. with the (Official Oppo Recovery)
1. Download this zip file
https://mega.co.nz/#!7M5DiTZY!fYtWdLydSKXBWM02qssISfQNr884MUliwnHBRpsHRRo
2. Put that in your phone, root directory
3. Power off you phone
4. Power on with the key combination (power + Vol-)
5. Choose English
6. Install zip file
7. choose the zip file you download in step 1.
8. Done , your device rooted.
Frequently asked questionQ: Will "ROOT" void the warranty?A: Hell No! Only Damage on Hardware void the warranty.
Courtesy of Kedros NG ( oppoforums )