Himedia H8 Plus octacore downgrade

[Zbyszek]

Hello everyone
Please help me!!!
I installed firmware 1.1.7 and the problems started.
There is no way I can connect to the Google Play Store.
I get the message: Server error
Every attempt to update any application from the Google Play Store ends with the same message.
I cleared the application memory and the server error still persists.
And now the most important thing, I tried to downgrade the firmware from 1.1.7 to older versions (1.0.7 - 1.0.9 - 1.1.2 - 1.1.3) and each attempt ends with an error and a message that a version older than 1.1.7 cannot be installed.
Please help!!

[Zbyszek]

No one can help?