how to reset the Cisco AIR-SAP16021-T-K9 device.

[diegosilvestrevalentim]

Good afternoon, gentlemen, I have a Cisco AIR-SAP16021-T-K9 device.
when updating the firmaware it no longer connected with a computer and now I can't access the equipment or reset the factory settings.
Could you help me out of kindness?

[patoberli]

First of all you need to establish a console connection with a Cisco console (serial) cable. How to do that (it's the same for your model):
https://www.cisco.com/c/en/us/td/docs/wireless/access_point/12-4-25d-JA/Configuration/guide/cg_12_4_25d_JA/scg12-4-25d-JA-chap4-first.html#76570
Then please post the full boot process of the AP here.