Sunstech CA107QCBT 32GB Manuel D'utilisation page 10

--Depending on the surrounding environment, such as the wall material, radio wave receiving condition, or obstacles between the device
and the wireless LAN router, the communication distance is lower. Move the device and the wireless LAN router closer to each other.
--Devices that use a 2.4GHz frequency band, such as a microwave, Bluetooth, or digital cordless device, may interrupt the communication.
Move the device away from such devices, or turn off such devices.
Resetting the device:
You may have to perform a reset if your device, not respond correctly.
If your device does not respond through touch panel or this blocked.
You can reset the device , use a small thin object (such as a paperclip)
to press the reset button. See "Device Description" step 6.
How to download the software using the unit.
IMPORTANT: When you download the software, all data will be deleted as photos, videos and Apps that you have been installed.
Do not interrupt this process please make sure the battery is fully charged.
Please, follow these steps.
1- Open browser and search and open this link: http://www.sunstech.es/download/
2- Select the model of the tablet that you have and download the software.(This software is installed In the INTERNAL SD).
3- When it finished the download, select the App " update " in your unit.
4- Select "Local Update", "download".
5-Select the software / Download and wait until the process is finished.