To reset the device to factory default settings:
• To restore the device to the factory default settings, with the power on, press-and-hold the Reset button with a bent paperclip for more than 10 seconds.
– All of the lights will go off.
– Release the Reset button when power light turns on
The factory default username is cisco and the default password is cisco.
Did you try these username and password?
Please refer to the following links for more details:
http://www.cisco.com/c/dam/en/us/td/docs/wireless/access_point/csbap/wap121/administration/guide/WAP121_321_AG_en.pdf
http://www.cisco.com/c/dam/en/us/td/docs/wireless/access_point/csbap/wap121/quick_start/guide/WAP_121_321_QSG.pdf