why is my phone so slow

[erica 51]

I did I factory reset on ny phone and its been up dating for about 3 hours and its only on 31% I haven't even been messing with it why is it doing this

 

[B. Diddy]

Welcome to Android Central! What has it been updating? Apps? The OS?

It's a pretty old phone, so it's possible the firmware has become corrupt, or the hardware is failing.