General
This issue is being seen in 1 out of ~15 cases. If the customer has a CAPWAP AP (which is EWC capable) and they are trying to convert it to the EWC mode for the first time they may face this issue.
Symptom
When "ap-type ewc-ap" from AP shell is issued, after both AP and controller images downloaded, there might be problem in the starting of controller image with the following or similar logs:
11:18:09 Upgrading ...
11:18:09 status 'upgrade.sh: Script called with args:[NO_UPGRADE]'
11:18:09 do NO_UPGRADE, part1 is active part
11:18:09 status 'upgrade.sh: Script called with args:[-c PREDOWNLOAD]'
11:18:09 do PREDOWNLOAD, part1 is active part
11:18:09 status 'upgrade.sh: Creating before-upgrade.log'
11:18:10 status 'upgrade.sh: Start doing upgrade arg1=PREDOWNLOAD arg2=,from_cli arg3= ...'
11:18:10 status 'upgrade.sh: Using image /tmp/cli_part.tar on axel-qca ...'
11:18:10 status 'upgrade.sh: Error: image /tmp/cli_part.tar not found.'
11:18:10 status 'upgrade.sh: Cleanup for do_upgrade...'
11:18:10 status 'upgrade.sh: /tmp/upgrade_in_progress cleaned'
11:18:10 status 'upgrade.sh: Cleanup tmp files ...'
11:18:10 Failed to update flash
11:18:10 Image download completed.
Conditions
This is applicable to EWC capable APs that did not have EWC image and is trying to to convert CAPWAP AP to EWC AP for the first time
Workaround
Issuing the same command again usually fixes the issue.
