What is the lifespan of popular cell phones?

Phones begin to perform worse over time, their batteries drain faster, random failures occur and they begin to work more slowly. Since smartphones are usually not a cheap investment, it is useful to know the average lifespan of popular…

How to reset drum counter on Brother MFC-L2712DW

Relpace your drum unit with a new one. Make sure the machine is turned on. Close the front cover. Press OK and the Up arrow key at the same time. Press OK to select Drum. Press the Up arrow key to reset the drum counter.…