Jiayu F2 is a cost-effective smartphone with MTK6582 Quad Core, LTE 4G+GSM Dual SIM Dual Standby, 2GB RAM+16GB ROM,5MP+8MP Camera, Android 4.4 OS and 3000mah Battery.
The user can download official rom from http://cellphonemic.com/jiayu-rom-recovery . If you need to install custom recovery like TWRP, you can find at http://4pda.ru/forum/index.php?showtopic=596056&st=1360#entry41052897;
After installed this third-party recovery for Jiayu f2,You can root or backup the OS. The way to enter recovery mode is: Use usb cable to connect the f2 with PC, then put in the battery, press volume+ key and power key at the same,don’t loose the volume+ key until TWRP icon shows.