Unfortunately, my GT Combo also broke down last year, with no hope of being repaired.
looks like they have a tool now to unbrick a bricked COMBO https://www.freesat.cn/forum/viewtopic.php?f=51&t=12172
www.satellites.co.uk
I now have a V9 prime. It's not as sensitive with low-power carriers as the Combo.
of course it doesn't do 422 directly (although on the combo it was sometimes very unstable) otherwise it's a very decent receiver
where you can indicate the frequencies of 10490 (amateur radio on 26 East) which allows you to use a standard LNB, it can also read very small SR (sr300 is the limit that can be given with the original firmware). With Mars, it can go even lower (be careful, once the receiver is on Mars, it's very difficult to go back to zero).