My versa is associated to another developer account (this of my girlfriend). How to remove it?

[waszumkuckuck]

I bought a new versa and changed them with my girlfriend.  

Before this I played around with her versa and her account and created a developer account to upload a watch face. 

Now her versa become my but is still associated with her developer account what leads to that I am not able to create a new developer account for me because the versa is still connected to her account. 

I already unpaired the versa with her mobile and reseted it to default and paired with my.

Error message:

It looks like your watch is already associated to another developer account. One watch can only be associated to one Fitbit developer account at a time.

Contact appgallerysupport@fitbit.com if you need assistance.

I already wrote an email but nothing happened so far. 

Can I solve this issue by myself?

UPDATE:

Called yesterday the (really friendly) support in Germany. He guided me thru a factory reset but this was unfortunately not the solution. They are checking this topic today internally and I will get a call back this day. 

[JonFitbit]

Did you get this resolved?