The receiver has hardware multiboot, it has a recovery image. As such, there is no "base image". Think of it as a bootloader.

ABM for satellite does not interrogate the frequencies like the Enigma2 scan, it uses the data on the tables. It tunes into the home provider to read the data. For Sky UK it is 11778 MHz, Vertical, 27500. For Freesat it is 11426 MHz, Horizontal, 27500

If you are still having the satellite frequency issues, then Huevos' assessment about LNB is most likely the most relevant one. Are you able to test receiver at a family member/friend's house? Must not be a Sky Q wideband LNB.