11.3b10 was the last software version downloaded before the TiVo service was shut down.
11.3b8 was the previous version. Both were catered for in the OzTiVo software enabling update.
If you have backups of 11.3b10 these would be the best to use however first check whether the recipient TiVo has a media access key (MAK) enabled as once you have lost this you won't get it back.