Depending on the tool you are using, the location for this file on your SD card varies:
: This is the most common method. Boot into GodMode9, navigate to your system files, and use the script options to dump your console's seeds. Using SEEDconv : You can take the raw system file from nand:/data/(console-unique)/sysdata/0001000f/00000000 and use the utility on your PC to generate the seeddb.bin Third-Party Lists : There are community-maintained versions (like those from ihaveamac on GitHub 3ds seeddb.bin
You placed seeddb.bin in /gm9/support/ . Move it up one level. Depending on the tool you are using, the
seeddb.bin contains title keys. Fact: No. Title keys are stored in ticket.db . Seeds are a separate, additional secret. Move it up one level
3ds-seeddb fetch --titleid 00040000000F9800 --seeddb seeddb.bin
[1:] SYSNAND CTRNAND -> dbs -> seeddb.bin (Press DEL , confirm).
: It is a required file for PC-based installation tools like Custom-Install