you shouldnt factory reset from inside a rooted phone... only from the custom recovery... to access it:
-slide keyboard out
-hold X/powerkey at the same time until the logo appears
-slide keyboard closed
to navigate the menu:
-vol up/down= up/down
-power= back
-camera= select
from here you can go to:
-backup and restore
to see if the previous owner made a nandroid backup... if there is one, then you can simply:
-wipe cache>yes
-wipe dalvic cache>yes
-wipe data/factory reset>yes
-mounts and storage>format boot>yes
-mounts and storage>format data>yes
-mounts and storage>format cache>yes
-mounts and storage>format system>yes
-backup and restore>restore>(select backup file)>yes
-reboot system now (when it finishes)
if there is no backup present when checking initially, back out to the main menu and select:
-reboot system now
after its fully booted, go to the playstore and update superuser... while there, lookup launchers, themes, widgets, etc... make the phone how you want it... then go pack into recovery as mentioned before, navigate to:
-backup and restore>backup>yes
-reboot system now (when its finished)
now you can easily restore your phone to the way it was set when you made the backup...
id definitely get rid of any bloatware to slim things up, delete the previous backups and make a fresh one (so its the only one in the clockworkmod folder, for easy reference)...
youll need a root capable file manager (such as es file explorer) to mount the system folder and delete bloatware... follow these links, read up, and enjoy!...
http://forums.androidcentral.com/mo...3-how-videos-one-stop-guide-rom-flashing.html