Download the Autonomous image from cisco , i used: c1520-k9w7-tar.152-2.JB.tar

Give your laptop a static IP (example below uses /24)

Connect laptop directly to 1552 and have your TFTP server running

When the 1552 starts to boot, hit the escape key (not break). This will bring you to an " ap: " prompt.

Then do the following:

ap: format flash: (not an obligation)

ap: set IP_ADDR (IP address of your AP)

ap: set NETMASK

ap: set DEFAULT_ROUTER (If you have one)

ap: tftp_init

ap: ether_init

ap: tar -xtract tftp:// flash: (wait ....)

ap: set BOOT flash:/c1520-k9w7-tar.152-2.JB/c1520-k9w7-tar.152-2.JB

ap: boot

Your AP boot on autonomous firmware and you can now connect on http admin interface : with default login/password (Cisco/Cisco)