Ap update result. 1 means success 2 means failure, unknown error 3 means failure, insufficient AP memory 4 means failure, fail to download the file 5 means failure, mismatch between the version in the EFS tail and the version in the file name 6 means failure, invalid file name 7 means failure, mismatch between the AP type in the EFS tail and the AP 8 means failure, file content error 9 means failure, writing flash memory failure 10 means failure, upgrade timeout 11 means failure, the communication between AP and AC fails