The access point is not flashed.

[schikannikov]

The access point isn't downloading firmware from the TFTP server. The current firmware is corrupted, and I don't know how to restore it to a working state so it can communicate with the controller. Currently, the access point has corrupted firmware for standalone operation.

[Mark Elsen]

    - @schikannikov       Factory reset the access point and try to recover it from there :
                                                        Look at this example for instructions :
                                        https://community.cisco.com/t5/wireless-mobility-knowledge-base/access-point-rommon-recovery-ap-prompt-recovery-example/ta-p/3119495

    M.

[ammahend]

In case factory reset does not work, 1830 is still in hardware support period, so with limited lifetime warranty you can get an RMA from Cisco within 10 business days. 

[Leo Laohoo]

The 1800-series AP is well-known to have high failure rate.  

I strongly recommend contacting TAC and organize an RMA while it is still possible.