Yeah, this issue has nothing to do with the conversion.
The "SAPD: Reboot after image upgrade failed" may be due to various factors, from incorrect country code config on the controller, to firewall issues, VLAN misconfiguration, etc.
Did you try AP factory reset?
Did you try to run AP and VMC on different subnets?
Perhaps don't rely on ADP and set your master statically to 192.168.20.16?
Don't know what else to suggest besides googling and perhaps asking aruba community.
EDIT: Actually, the controller logs might be more helpful.
The "SAPD: Reboot after image upgrade failed" may be due to various factors, from incorrect country code config on the controller, to firewall issues, VLAN misconfiguration, etc.
Did you try AP factory reset?
Did you try to run AP and VMC on different subnets?
Perhaps don't rely on ADP and set your master statically to 192.168.20.16?
Don't know what else to suggest besides googling and perhaps asking aruba community.
EDIT: Actually, the controller logs might be more helpful.