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In short below are the step to Upgrade SCCM CB/CBB(1511/1607)

In short below are the step to Upgrade  SCCM CB/CBB(1511/1607)
Upgrade ADK
Upgrade MDT
Backup ConfigMGR DB
Upgrade SCCM 2012(*  version )– >> Confimgr * Version(1511/1607/)
Update Boot Images
Upgrade SQL to 2016
Export SUSDB using WSUSUTIL.EXE
Uninstall WSUS
Uninstall SUP
Upgrade OS to 2016
Fix IIS Issues (if upgrading from 2008 R2 and App Pools are having issues_
Reinstall BITS
Restart Windows Process activation and WWW
Import SUSDB
Reinstall WSUS
Reinstall SUP
Validate Functionality and trobleshoot issues as they come up( Insepct monitoring node and Ensure compnents are Functional and not having issues

So, what do you think ?