LG G5 LS992 ZV8 unlock possible?

Hello dear GCPro Key team!
Alot of people wich have unlocked lg g5 Sprint, are facing a problem after upgrading to zv8 firmware (Android 7.0)
The problem is: continuously getting the message "Unfortunately, LG IMS has stopped" every 2 secs. Nothing helps, even hard reset don’t help.
The only solution is doing ##RTN# reset. But after this unlock is gone.
As I know from the other GCPro Key owners, now is impossible to unlock LG G5 LS992 on zv8 firmware. Downgrading to Android 6.0 is also impossible.
Is there any luck to resolve this problem?
Thank you in advance.