Originally Posted by 918273645ams
this isnt helpful can someone please give me sstep by step
The red exclamation is your stock recovery
. You just have to enter the recovery mode to access the recovery menu.
To do that, still in front of your red !, press power and tap volume. The menu shows up. Select "wipe data/factory reset" and reboot.
Your phone will be in the state it was when it was delivered to you
Google G1 - CM -7.2.0-DS
Google Nexus One - unlock - root - CM10.1 VJ JB 4.2.2 v6.0
Google Nexus One - stock (hers)
Google Galaxy Nexus - Stock JB 4.3 - unlock - root
Nexus 7 - Stock JB 4.3 (hers)
Nexus 10 - Stock KK 4.4 - unlock - root
Nexus 4 - stock KK 4.4 (hers)
Nexus 5 - unlock - Stock KK