How to unlock my phone - which is locked by the device manager?

I have an Samsung Galaxy S3 Neo

Bus 002 Device 042: ID 04e8:6860 Samsung Electronics Co., Ltd GT-I9100 Phone [Galaxy S II], GT-I9300 Phone [Galaxy S III], GT-P7500 [Galaxy Tab 10.1]

The keyboard & language setting is português.

I today installed Android Device Manager and to test it's functionality I locked the phone with the password: "abcd" (4 letters were required).

After entering the password and confirming with the "ok" button of my keyboard, the phone showed me that the password is wrong. "Senha incorreta".

I resetted the password after some tries to "123456" and the phone reloaded the lock screen. Again the password showed up to be wrong. I also tried the alphabetic password: "abcdefg" - same error.

I changed the language of my Google account from german to portuguese and resetted the password to "123456" again and I tried to really reboot my phone and unlock the simcard again. But anyways I can not get threw my lock of the Android Device Manager.

I tried to enter the password 35 times wrong with hope to get a chance to authenticate with my Google-Account Logins.

I also tried to connect the phone with adb but it does not show up in this state with:

adb devices

So what can I do to get access to my Samsung Galaxy S3 Neo again?