Question [Q] Firmeware Update with LG Support Tool - D802 rooted

I am running a D802 with Stock ROM (D80220b-EUR-XX).
The phone's rooted and I have a Recovery (TWRP) installed.

I am not really into flashing ROMs, but the main reason for me to root was to use xdabbeb's camera Mod, as well as Viper4Android.

Now there's a new firmware available (20f) and I am wondering if it would work to update my device with the LG Support Tool, as I won't be able to install the update OTA?

When connected, the LG Support Tool tells me that there is an update available, but I am not sure if this would work, or if I end up in a bootloop, as I have a recovery installed. Also, I wouldn't want to loose all my data or internal SD data...

- So, is it possible to update my G2 with the LG Support Tool even though I have a recovery installed?
- If yes, would I loose all data?
- If no, I guess I could always flash the kdz with this method thread, but I guess I couldn't use the "normal flash" mode and would loose all data anyway


Thanks in advance - any input is appreciated