WA6638 AP image download failed

Normal AC and AP network topology

Device model: Converged AC S5560 + WA6638 

AP repeatedly download apimage can not be online, after closing the version verification can be normal online; The following logs were found on the AP:  

<H3C>*Apr  3 16:03:37:258 2023 H3C CWC/7/ERROR: Failed to set wa6600.ipe as boot file.                                                  

*Apr  3 16:03:37:277 2023 H3C CWC/7/ERROR: Failed to handel led blink because pstAccb->bIsMaster is false, enCwcState = 2.              

%Apr  3 16:03:39:558 2023 H3C CWC/6/CWC_IMG_DOWNLOAD_START: Started to download the image file wa6600.ipe through the CAPWAP tunnel to A

AP Version：                                                                                

<H3C>dis version                                                                                                                       

H3C Comware Software, Version 7.1.064, Release 2457                                                                                     

Copyright (c) 2004-2022 New H3C Technologies Co., Ltd. All rights reserved.                                                            

H3C WA6638-JP uptime is 0 weeks, 0 days, 0 hours, 8 minutes                                                                             

Last reboot reason : User soft reboot                                                                                                  

AC Version：

<L3-012-A02A>dis version                                                                                                               

H3C Comware Software, Version 7.1.070, Release 6530P02                                                                                 

Copyright (c) 2004-2022 New H3C Technologies Co., Ltd. All rights reserved.                                                            

H3C S5560X-30C-EI uptime is 5 weeks, 1 day, 0 hours, 37 minutes                                                                         

Last reboot reason : Cold reboot                                                                                                       

Boot image: flash:/s5560x_ei-cmw710-boot-r6530p02.bin                                                                                  

Boot image version: 7.1.070, Release 6530P02                                                                                            

  Compiled May 11 2022 11:00:00                                                                                                        

System image: flash:/s5560x_ei-cmw710-system-r6530p02.bin                                                                               

System image version: 7.1.070, Release 6530P02                                                                                         

  Compiled May 11 2022 11:00:00                                                                                                         

Feature image(s) list:                                                                                                                 

  flash:/s5560x_ei-cmw710-freeradius-r6530p02.bin, version: 7.1.070, Release 6530P02                                                   

    Compiled May 11 2022 11:00:00                                                                                                      

  flash:/s5560x_ei-cmw710-escan-r6530p02.bin, version: 7.1.070, Release 6530P02                                                        

    Compiled May 11 2022 11:00:00                                                                                                       

  flash:/S5560X-CMW710-UWW-R5441P02.bin, version: 7.1.064, Release 5441P02                                                             

    Compiled Mar 29 2021 16:00:00                                    

There are two possible reasons why AP keeps failing to download the image file: 

1. the version is not correct 

2. the AP has insufficient space left

After confirmation, the AP space is sufficient. Check if the version is adapted.

Factory version of AP: R2547 

AP image file present in AC: R2441P02

Subsequently, after confirmation, it was found that WA6628/WA6622/WA6638/WA6630X/WA6620/WA6620X/WA6638i/WA6628X/WA6628E-T FIT mode, starting from E2444, cannot be rolled back to the version before E2435P02.

1. Disable the version check of AP for use

<AC> sys

[AC] wlan global-configuration

[AC-wlan-global-configuration]firmware-upgrade disable

2. Upgrade the version of AC to be higher than AP