Damn for every update I have collected trafic packages via vpn sniff. But since HTTPS was used pcap didn't also decode/include the ssl trafic and I cannot get the update file (*.ozip) from it.
Since I don't have a rooted phone I cannot get the update package from system app com.oppo.ota.
Access is denied.
Smart move with using Poland vpn, it worked, i got an instant update to RMX3081_11_A.43. Tank you very much for helping me and for your all informations about our device.
Just tried on Germany vpn an i got RMX3081_11_A.44, it's a good thing we can update with this trick.