samsung – Combinable firmware for the old S7

I have an old s7. Looking through the settings, it is written:

Model Number: SM-G930FD
Building Number MMB29K.G930FXXU1BPIF
Verion Baseband: G930FXXU1DEQ

I'm trying to find a compatible firmware to manually install because when I asked the phone to look for updates, it found nothing. The device has Android 6.0.1 with security update of September 2016 that seems very insecure to use.

I'm trying to find a compatible update, preferably based on Android 8 and released in the last two months. However, I do not know what to use.

Another strange thing is that when I try to find the existing firmware on the device, I can not find it when looking for the SM-G930FD. However, I find this entry for the SM-G930F with PDA G930FXXU1BPIF. In addition, if I switch to download mode, the phone displays:

I do not know what to do with that. Is the phone a G930F or a G930FD? And what should match when I try to find an official firmware that should match the hardware of this phone?