P10 no network after Vendor change and update Android 9

[Facile]

Hey, guys. Anybody ever run into these?
I've got some phones VTR-L09 that got an update on Android 9 after Vendor's change.
And they all no seeing the network.
I made a rollback to Android 8 and the network working again.
I switched to a VTR-L29 model and...tried to flash Android 9 again.
Same result... no network.
Sigma cannot remove security to change vendor again or get unlock bootloader.
What can you do to get android 9 with a working network?

P.S. I don't have a bootloader code(

[GSM_Support]

@ Facile,

Current case was transferred to developers team for a detailed analyzing purposes.

Best Regards
GSMServer team

[yura_if]

Hi. Have the same problem, you know how to fix it?

[Facile]

Originally Posted by yura_if

Hi. Have the same problem, you know how to fix it?

Hey, I haven't found a solution to this problem. But you can go downgraded firmware on Android 8 through Hi Suite. This automatically downloads the rollback and installs it. The Android 8 network is still working. The problem is that phone regularly asks for updates and you have to press "no" all the time.