LG Optimus F3 runs android 4.1 Jelly Bean operating system, it is only a mid-end cellphone, but I am sure it will be updated to android 4.3 later, as android 4.3 was just announced. Only a few cellphones received android 4.3 update until now, but more and more cellphone will get android 4.3 firmware update soon.
Now more and more users want to personalize their LG Optimus F3, when they just got this cellphone, they root and install custom ROM at once. When you do these works on your device, you may brick your device. At that time, you need to brick your device to stock. Official firmware is needed.
LG has released the first official firmware for LG Optimus F3, I am sure you will need this official firmware. Now download the official firmware by the following link.
LG Optimus F3 stock ROM
The LG Optimus F3 has been available at Sprint, it will be available at T-Mobile soon. T-Mobile may offer better deal to us. Many users like this cellphone, if you are interested in it, you can get one from T-mobile soon.