My brother and I both have used Delta Chat for over six months both using Gmail accounts. It has worked very well up to now, but then my brother changed his Gmail account password to be a little more secure. That broke Delta Chat and he and I have worked on it for six or seven hours but could not get his account to reconnect back to Gmail. Finally he deleted everything on his desktop and tablet having to do with Delta chat and reinstalled it and basically reconnected it to his Gmail account all over again, but in the process lost access to all of the thousands of encrypted messages that are still there in his Gmail account but that he cannot read, and are not shown by the newly installed delta chat.
The question is very simple: is there any way to change a Gmail password and not destroy Delta chat which is using that account? If anyone has successfully done that, could you say how you did it? it must be trivially easy, but he and I have not found any way that can be done. Both of our Gmail accounts do NOT use multifactor authentication but rather simple straightforward passwords.