Always use a console cable to monitor the boot process. This allows you to see if the AP is failing to find the image or encountering memory errors. C1240 K9w7 Tar 124 25d Ja2 Tar - Google Groups
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. C1240 K9w7 Tar 124 25d Ja2 Tar 26
Users frequently encounter "Tar checksum errors" if the file is renamed incorrectly during a TFTP recovery process. To avoid this, it is recommended to keep the original filename unless performing a specific password/image recovery boot. Always use a console cable to monitor the boot process
Resurrecting a Legend: The Cisco Aironet 1240 and the "Autonomous" Upgrade The "124" likely corresponds to the versioning—in this
firmware allows you to run this AP without a Wireless LAN Controller (WLC), making it perfect for: : Mastering the Cisco CLI without buying a $500 controller. Legacy Device Support
The text you provided appears to be a specialized shorthand or archival reference for from the WWII era.
“Tar” strongly suggests coal tar, bitumen, or petroleum residues. Example: