A ima novi firmware.
https://www.reddit.com/r/Monitors/co...1dgf_and_dell/
S2721DGFA was introduced because of
this EU regulatory which came into effect on nov 1st.
S2721DGF and S2721DGFA are technically the same, only the out of the box power consumption is different and was adjusted in the new firmware.
therefore S2721DGF is not manufactured anymore and got replaced by the S2721DGFA.