2nd sim diappeared after 8.0 android update

[VEN-C-US]

I just installed the latest version of android software 8.0 and the second sim is no longer detected. I was just using it an hour ago...

Any solution?

[Qatrium]

@VEN-C-US

Did you update normally or you flashed a firmware?

[VEN-C-US]

Normal download and update.

[Lord_viridis · Accepted solution]

Can you try safe mode to see if it's system fault or 3rd party. Then. 

backup using Xperia Companion to save your files, then a

software repair using Xperia Companion

[VEN-C-US]

After I booted in Safe mode and power off then on, the problem was fixed, just for a few minutes, then the second SIM disappeared again. 

What should I do now? Run the Companion with the repair?

[Lord_viridis]

I would do that, yes

[VEN-C-US]

I found the solution! The Assist app is causing the trouble. Probably the software is not developed for 2 SIM cards and it is blocking one of them. When I deactivated it (and restart, without repair), all is running as normal. It was a nice extra which obviously cannot be used with the 2 SIM version for now.