Oppo A37F : root

Downgrade, using memory card, choose on of them

• A37fEX_11_OTA_014_all_201610141638.zip,
  OTA, copy to flash disk and run from recovery menu
• A37fEX_11 jadul.zip
• A37fEX_11_A.07_160614 (RepairMyMobile.in).rar, 
  oppo a37f v16 suport root, flash it using flash tool
• ROOT A37F OTA 161221.zip
  Rooting tools
• geteröppoa37f.rar
  For unbrick a37f using qfill

After that you can root using kingroot