My osmo was functioning well apart from the sound which was sometimes working and sometimes not
so I uddated the firmware after that the osmo became worse and would not maintain the correct horizon even after calibration plus the drifting issue mentioned by other users

I would like to cancel the update until a new one fixes the glich
how I can do that ?

Cant downgrade its the same thing for the inspire and phantom

you cant downgrade same thing for the inspire and phantom. Next time wait before updating and see if others get bugs.  

after one day of using the osmo with the update it seems that the problem has disappeared
now the horizon is maintained perfectly well especially when filming indoors
I have to test it outdoors though

I tried outside

the problem of horizon is still there

problem of the horizon is still there