En
esta página, la gente de Firebird informa de esta "posible incompatibilidad" entre FB 2 y FB 2.5
Aparentemente, lo que tienes que hacer es restaurar tu base con los switches -fix_fss_data and -fix_fss_metadata
Cita:
Effects of Unicode Metadata
If you have not previously updated text objects within the metadata of your databases to be in character set UTF8, restoring a database until V.2.5 will fail with “malformed string” errors. To resolve this it is necessary to pay attention to the files in the /misc/upgrade/metadata directory of your installation and to use the new -fix_fss_data and -fix_fss_metadata switches in the gbak command line.
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