I have some kind of solution now! Android Opera browser 53 didn´t sync, but I changed Mini Opera to my all mobile devices and now sync works!
Posts made by timovk
RE: Opera not syncing passwords UbuntuOpera for Linux
I had same problem. Opera sync didn´t work between my Windows / Mint browsers - Android Opera mobile browsers. I found out that version 53 (Android) didn´t sync, but I changed it to Opera Mini Browser and now it syncs between all devices!