So, I ended up sending my Mopho motherboard back to the factory to have it reflashed.
It finally arrived 1 month after sending it off, due to Christmas and COVID-19.
Having read and research a bit further I found out that some units oif the Tetra up to 2200 (something like that) had from factory, not had some ending added to the OS, so that if you tried to update the OS it would not complete. Seems this to be the case for some MOPHO models too. I guess this was the case in mine.
So advice to new Mopho owners don't update your OS !!