Unexpected db error after rollback

site was running well with XF 2.2. Attempted online upgrade which failed (blank page displayed) after accepting the test/backup warning page message.

Decided quickest solution whilst away from home was to rollback using host's Jet Backup files for the domain.

This has resulted in An unexpected database error occurred. Please try again later.
Page Source shows:
!-- MySQL statement prepare error [1146]: Table 'laverdaf_xenforum.xf_data_registry' doesn't exist -->...

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