The delivered device displays after powering only a Bluscreen and no language or main menu. The inquiry at Amazon revealed that a firmware update is necessary. This needs to be downloaded from the Internet on an SD card. The operating instructions for the device and a description for the update is available only via the Internet. An installation is not possible due to lack of display. Even the replacement had the same problem. Therefore, I have both sent back. I would have expected that the device is usable after recharging, but this is not the case.