here is a video regarding the satellite signals, which you’ve said are available after firmware update:
Please check what’s wrong there.
After updating to the newest south firmware, the optional satellites still not available. So please contact south when they plan to provide an update to access the addional satellites.
checking for you! in the meantime, which correction network are you using?
I use SAPOS-BW. Currently it uses GPS, Glonass, Galileo and soon Beidou.