I've just now tried to add my OBi110 to another account (without first removing it from the original account) and received the following response on the web page. I've replaced real data with asterisks.
-------------------------------------------
Add an OBi Device
Congratulations, we have matched your device, Please verify the following information.
Device Model: OBi110
Device OBi #: *********
Device MAC: ***********
Device SN: ***********
Status: Connected-other
However, your device is secured by password. We need to verify the password(s) first:
Please select
1. I know the admin password and would like to use admin account
2. I want like to use user account
------------------------------------------
(Yes that is the verbatim bad English of choice #2)
Doesn't match with what the OP reports from his newly acquired OBi.