Qianli I dfu go quick recovery modFeature:

Enter recovery model within 2.8 secs
Auto switch to recovery mode when connected
Auto on-line upgrade available
Fast adapt to new ios system, new modelconvenient to upgrade
Modifying the phone without switching cable
Start modification while enterrecovery mode
Enter modification mode easily even with malfunction button & touch. 
Available to modify cell phone with layered motherboard test frame oreven motherboard only