factory reset s3

[blackmarket#AC]

how do i completely erase my device and flash it back with official firmware i have a telus(canadian carrier galaxy s3)

 

[nelonez]

Settings> back up and rest> restore to factory

Sent from my SAMSUNG-SGH-I747 using Android Central Forums

 

[blackmarket#AC]

do i have to re
download my os?

 

[Blazer]

No... the OS will still be there. When it boots up, it will just like when you turned it on right after buying it.