What do you mean by custom OS who told you that?
Anyway you will need to wipe the phone and you will lose all data on the phone.
Turn off the phone, once it's off hold power volume up and home release power and keep holding other keys when the screen lights up.
It will start booting recovery mode. If you get no command screen try pressing a combination of keys to unhide the recovery menu.
You can navigate recovery menu by using volume keys. Power button to select an option.
You can even swipe up and down the screen to navigate the menu.
The option you will want to choose is wipe data / factory reset. Once you have done that reboot phone and set it up again.
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I did a factory reset on my Samsung 7s yesterday and it then told me to enter my password to go further, but I didn't see a password so now I can not do anything with my phone. I can't even power it off now. I tried to just hold the power, home and volume up buttons but now it's downloading a custom os. The reason I did a factory reset was because my friend too my SD card and sim card out and put it in another phone so I could possibly then use that one. Well it wouldn't work so he put them back in and ever since I haven't been able to make or receive calls. I'm very very frustrated now because he's gone and I can't do anything on the phone so far. I'm using a phone he left here to look up the instructions on doing another reset but since I can't even turn the thing off now without entering my password... It now is doing a custom os download... Please help. What can I do now??
Please advise
Thank you,
Vanessa
crwdns2934271:0crwdnd2934271:0 Vanessa Allen crwdne2934271:0