There is no firmware link for any BT hub. Firmware updates are automatic, there is no manual facility to update BT hubs.
Same problem here, as well. Firmware version SG4B1000E020 updated 02/Apr/20. Can I please get v0.26.04.04227 or newer?
@VeteranISPUser you are correct. My bad. Have been using my old BT router, since with the SH2 I cannot use my Brother printer which only supports 2.4GHz. My devices usually connect to 5GHz and they cannot recognise the printer. Hence the need for the new firmware.
I'll connect the SH2 and come back with the firmware number.