Cannot delete device in console - "The agent xxxxx is managing other devices.

Hi!

I have a problem deleting a Hyper-V host that is phased out. SCOM says it is managing other devices. I use SCOM 2012 wiithout any SP or R2. I've tried running this script directly in SQL Operations DB

UPDATE dbo.[BasemanagedEntity]
SET IsDeleted = 1
where Fullname like ‘%FQDN%’

Without any luck. Any help appreciated

Best regards

Rune Haugen