If the phone is using Android as the operating system, then the Recovery mode combo trigger might be different. Here are the most usual combinations used to access the Recovery Mode:
- Volume Up + Power
- Volume Down + Power
- Volume Up & Down + Power + Home
- Volume Up + Power, release Power and keep the other one pressed.
One of these combinations should work, but in case it still fails, then you have to take the phone to factory service or visit your local phone service shop. They will fix it for a very small fee.