Only the “USE_FRM” option of the REPAIR will help you now.
Use this option only as a last resort.
Afterwards, use “SHOW TABLE STATUS” to check the amount of rows and the auto_increment.
If necessary, adjust the value with “ALTER TABLE t1 AUTO_INCREMENT=
As with any REPAIR, make a copy of the table-files first – so that you have something left, in case the REPAIR emtpies your table.