AP 7372 WILL NOT JOIN ZD FIRMWARE UPGRADE LOOP

[kurt_cedric_sal]

When joining two my 7372 (currently at  9.7.1.0.17) AP to the ZoneDirector (10.1.0.0.1515)  I get the following:
( MAC ADDRESS INTENTIONALLY DELETED )

2018/06/20  12:12:55 Medium AP[38:ff:xx:xx:xx:xx] joins with different firmware/custom file version and is being upgraded.
2018/06/20  12:10:28 Medium AP[38:ff:xx:xx:xx:xx] joins with different firmware/custom file version and is being upgraded.
2018/06/20  12:07:46 Medium AP[38:ff:xx:xx:xx:xx] joins with different firmware/custom file version and is being upgraded.
2018/06/20  12:05:14 Medium AP[38:ff:xx:xx:xx:xx] joins with different firmware/custom file version and is being upgraded.
2018/06/20  12:02:44 Medium AP[38:ff:xx:xx:xx:xx] joins with different firmware/custom file version and is being upgraded.
2018/06/20  12:00:12 Medium AP[38:ff:xx:xx:xx:xx] joins with different firmware/custom file version and is being upgraded.
2018/06/20  11:57:40 Medium AP[38:ff:xx:xx:xx:xx] joins with different firmware/custom file version and is being upgraded.
2018/06/20  11:54:53 Medium AP[38:ff:xx:xx:xx:xx] joins with different firmware/custom file version and is being upgraded.
2018/06/20  11:52:26 Medium AP[38:ff:xx:xx:xx:xx] joins with different firmware/custom file version and is being upgraded.
2018/06/20  11:49:55 Medium AP[38:ff:xx:xx:xx:xx] joins with different firmware/custom file version and is being upgraded.

ACTIONS TAKEN

1. Tried several Firmware Versions of the AP (100.x.x.x down to 9.5 ) and the result is the same as above:
* currently AP is at 9.7.1.0.17

2. Entered the CLI and tried to force update the AP with the following:
rkscli: fw force-update xxx.xx.xx.xx
fw: Updating rcks_wlan.main ...
**fw(7723) 172.16.17.18: CTL Get Error
OK

3. Enabled FTP on the Zonedirector to look for AP Specific Files:

Index of /zf7372/10.1.0.0.1515/
[parent directory]

rcks_fw.bl7 0 B 
rcks_fw.bl7.bkup 0 B
rcks_fw.bl7.bkup.version 14 B
rcks_fw.bl7.main 0 B
rcks_fw.bl7.option 28 B
zf7372_1010_cntrl.rcks 140 B

FILE SIZES SEEM TO BE TOO SMALL ( same sizes appear in all model-specific directories) ?

What is the next step now ?

Thank you.

N.B. I have two (2) other 7372s that have upgraded without a problem.

[kurt_cedric_sal]

Thank you for the reply.
As of this time, the APs have already been recognized by the ZD and have been updated as well.
1. I took route of a direct firmware upgrade to 104.0.0.0.1347 ;
2. Configured the static addresses the APs ( yes, I used static addressing for the APS and the ZD), and then after a reboot, the ZD recognized them and provisioned them with 10.1.0.0.1515

Don't want to tinker with it for now 🙂