QUOTE(manleong @ Jul 8 2014, 04:11 PM)
my phone was ap phone, have no idea which ftf to flash
my friend told me, any MODIFIED rom = custom rom, but i don't think the term are important
flash stock 4.4.4 mean that i will lost all my app and data

it gonna spend another whole day to do that
any tutorial for that? i think i need to flash back to my rom LOL?
how many ram show in settings? mine just 1.3gb used and 3xx mb free, total up just about 1.6gb
Another way to backup your apps, root your phone, install titanium backup, backup your apps, copy the titanium backup folder from your phone to your desktop.
Once done flashing the FTF, root again and install titanium backup and copy back the folder from your desktop to your phone(internal storage). If you have tons of app to reinstall, I suggest you buy the pro license. It allows you to install the apps automatically. The free version, you need to install it one by one the apps that you backup.
I'm not sure if there's any other backup apps in the market. Been using titanium backup for ages already. So far I'm happy with it.