Hello! Not so long ago we presented firmware v. 0.3.1 based on Ubuntu 15.04. We glad to announce you that now Ubuntu firmware available for installing on SD card. Special firmware available for Ugoos UM3, UT3 and UT3S devices.
It is will allow not only run linux on your device very fast without data loss, but also resume working on the other device in short time. For that you need only to get SD card from one device and paste them into another.
For flashing image to sd card in linux you can use dd command
sudo dd if=<path_to_img_file> of=<path_to_sdcard>
sudo dd if=UT3_SD_LINUX_0.3.1.img of=/dev/sdc
For flashing image to sd card in Windows you can use Win32 Disk Imager:
Win32 Disk Imager - download
Ugoos UT3 - download
Ugoos UT3S - download
Ugoos UM3 - download