QUOTE(facktura @ Aug 17 2014, 02:00 AM)
i've checked there is no "wipe internal storage" also to tick.
here it goes:
before u do anything. do this 1st.
power off ur device
press power button + volume down at the same time
once u feel the vibrate, release both button
1+1 logo appear
twrp menu appear (congratulations. u just learn how to enter into recovery mode

)
select backup
u will see, twrp already ticked 3 options for u, leave it as it is. dont change anything
at the bottom of the screen. swipe right to initiate backup
wait
wait
wait.. wah backup so long
ok once done back up
select reboot
select system
connect the device to ur pc
browse to folder twrp
u'll find ur twrp backups in there
copy paste that folder into ur pc
this is very important. just in case something goes wrong. this will help u to get back ur device.
(congratulations. u just learn how to do a TWRP Backup

)
now, to the next step.
power off ur device
press power button + volume down at the same time
once u feel the vibrate, release both button
1+1 logo appear
twrp menu appear
select wipe
select advance wipe
tick all 5 button, ie delvik cache, system, data, internal storage, cache
at the bottom of the screen. swipe right to initiate wipe
wait
once done. press back button
ur screen will go back to the previous screen that has 2 option: Advance wipe and format data
now select format data
screen will show some warning yada yada
type yes
swipe
tada
new opo with no OS
then, proceed to install ROM.
how? in twrp just now
select reboot
select bootloader
device will reboot into fastboot mode. how to know? this guy will appear on ur screen:

then use the steps already stated in page 1 on how to install rom.
ps: i went on and entered into my opo twrp for u to type all this
zzzzzzzzzzzzzzzzzzz
This post has been edited by Haters_Gonna_H8: Aug 17 2014, 02:48 AM