Alternative for CWM/CTR Recovery,here is TWRP recovery ported to Lenovo S939 by JM(me).Fully touch function and mount usb storage.
INSTRUCTIONS:
Flash with SPFlashtools or install recovery with MobileUncle Tools(need root).
More Instructions is here-> http://www.needrom.com/mobile/carliv-touch-recovery-7/
All credits goes to:
Teamwin
yuweng
JM