From my account I try to upgrade my Cerbo GX from 3.66 to 3.67, but get error saying that I do not have sufficient rights and a socket error. I cannot get pass this, wich happens at 40%. On my raspberry pi having the same version, it was no problem at all. Rebooting the device does not help.
I had this same issue when trying to update two different systems. No matter what I do, I cannot get the update to go through remotely. I have tried doing the update via the firmware update in VRM and via remote console on both systems. Neither process works and I get the same errors as the original poster. I am unable to try the updates locally because I and several thousand miles away from both systems currently.