Are you currently attempting to an access point or troubleshooting a "Tar Checksum Error" during a firmware update? C1240 K9w7 Tar 124 25d Ja2 Tar - Google Groups
“Pick C1240 from bin K9w7. Tariff group 124, 25-day storage, carrier Ja2, alternate tariff 26.” C1240 K9w7 Tar 124 25d Ja2 Tar 26
The "Tar" designation usually refers to a consolidated archive file format. The "124" likely corresponds to the versioning—in this case, Cisco IOS Release 12.4. Are you currently attempting to an access point