This issue affects only bttns running firmware version March 2015 (20150300 and 20150302).

When you enter your Wi-Fi settings on the bttn's internal website (, and choose open network, the bttn doesn't restart itself automatically after clicking "save".

The settings are stored, but the restart must be done manually - i.e. please just remove power for a couple of seconds and then re-insert.

Please note that in open network's name (SSID) you still cannot have special characters. 

This issue has been fixed in firmware version June 2015 (20150602).