@Igor_BAREEV Welcome to the Rockstor community.
That’s a pretty hefty upgrade and is not a supported upgrade path on testing. Essentially prior to 3.8.15 to 3.8.16 or later is not supported as a ‘stop off at 3.8.15 was require’, stable subscribers were sent the relevant instructions and should have been OK if auto updates were in place. Hopefully the following forum thread can help you get up and running again.
Bit of a pain but we transitioned from south to built in django database migration which was a non trivial change.
See how you get on and be patient as the migration can take a few minute in some instances. You may very well be better advise to do a re-install and import your pool/shares, ie Reinstalling Rockstor Just be sure to disconnect all data drives prior to attempting a re-install as it’s easy to pick the wrong disk. Also any data stored on the system disk will be lost. Best back-up all stuff prior to changing anything really.
Hope that helps.