Arduino TIAN Wi-Fi connecting problem

Hello there!
How can I reset the settings to the original?

I connected to Tian on my phone's with Wi-Fi. I typed 192.168.240.1 and entered the default password "arduino".
Further settings did not changed.
I opened Wi-Fi access on my phone and pointed the SSID name to the board, entered the Wi-Fi password.
When I pressed "Save", it stuck on 10% very long.
"Cancel" button didt work. I disconnected TIAN from Wi-Fi on my phone. After repeating first step I was get the message "Error while logging in: Invalid API method". All reset buttons didt helps (WLAN RST both 7-10 sec and 30+ sec).

Need help!