factory reset a device having no volume keys or home button I got a device that I have to reset to factory settings because the owner of the device has forgotten its password. I checked Debugging is not enabled.

I have seen various suggestions on how to reset a device but all suggestion involve volume keys. Unfortunately this device doesn't have any volume or other key, there is just only one power key.

Device: QMobile E885

How do it reset it ? or unlock the device. any suggestions?
There's instructions floating around for a QMobile E790, so this might work for your model. 

Try dialing 277634#*# or 47328545454#
It should then give you the option to factory reset.