ASE 12.5 no longer uses the buildmaster command. Instead, the dataserver command or sqlsrvr.exe for NT (the ASE product binary) has a new flag, -b, to run in build mode. Use the dataserver -b command where you used buildmaster in the past.
Because of changes in the master device and database, as well as the elimination of the buildmaster command, recovery is more complex if you lose your master device or database following an upgrade, Before upgrading. make both a physical dump and a bcp copy of the master database.
See the Utility Guide for more information on the dataserver command. See the Troubleshooting and Error Messages Guide for information about disaster recovery.