Our phones aren't exactly similar so. What works for the other might not work for you. I have a Samsung Galaxy Tab 2 10.1. Note that what I have is a TABLET, not a phone. According to the Samsung's site Help category,
in order to go to the selection of Resetting (i.e., Wipe cache partition, factory reset, reboot system) I must hold the POWER BUTTON & VOL. UP together.
However, holding them 'caused my device to head onto "Custom Os installation".
I figured out, what if I try holding the vol. down instead of vol. up?
Now, that was when it went to the selection of Resetting.
So, in simpler words: Try changing it up.
What worked for me:
Hold POWER BUTTON + VOL. UP = CUSTOM OS INSTALLATION
Hold POWER BUTTON + VOL. DOWN = ANDROID FACTORY RESET SELECTION
Remind you, this is what worked for my Samsung Tab 2 10.1.