Əgər cihazda S-ON varsa, AdAway işləməyəcək. Bu "funksiya" bir çox HTC cihazda mövcuddur və AdAwayın hosts fayllarını yazmasına mane olur
S-OFF means that the NAND portion of the device is unlocked and can be written to. The default setting for HTC devices is S-ON, which means that neither can you access certain areas of the system nor can you guarantee a permanent root. Furthermore, signature check for firmware images is also ensured by the S-ON flag.
Boot into the Boot Menu on your device by holding down volume down button while pressing power and the text on top will show the flag status as either S-OFF or S-ON. A full root generally means S-OFF.
More information can be found on www.addictivetips.com. Additional S-OFF methods since Unrevokable (in link) might interest you, namely: Revolutionary, Revone, Firewater, RumRunner, Moonshine, SunShine...
Prerequisite: You have to install a working Android SDK with ADB shell on your PC.