May I know which version of the EZ-Serial are you using?
The official released EZ-Serial has a known issue about the /QB command.
You can create a case to request a new version.
I think that the official Firmware version is only 1.1.14, so I am using this version.
If I use the new version, can I check the bonding information in /QB?
Yes, the new version fix the /QB command.