If your Douro's tablet no longer boots due to data corruption on its internal drive (see 'Powering on and off the Douro'), then the drive may be recovered by flashing it to factory settings.
To do so, you will need two USB flash drives (8GB or higher), a USB keyboard, and a Windows computer to create the recovery USB drive with.
The process below is for Douros shipped before January 2017 featuring an ACP-1103 model tablet.
If your machine's tablet features four black USB 2.0 ports at the top, then use this guide.
If the USB port next to the power button is blue, then use the instructions for the flashing ACP-1104.
Creating a bootable Ubuntu drive
Download Ubuntu 14.04 32-bit via Torrent.
On a Windows computer, burn the Ubuntu ISO image to a USB flash drive with Universal USB Installer.
Lamassu factory image
Download the factory image file for your machine:
Copy (as a file) the Lamassu image onto a second USB drive (best formatted as FAT32).
Booting to Ubuntu
Insert the Ubuntu USB into one of the black USB ports atop the Aaeon tablet.
Connect also a keyboard to the tablet.
Press the power button to the tablet, then repeatedly press the DEL key on the keyboard to boot into its BIOS.
Select the Ubuntu USB drive as the machine's boot drive, then save and exit. (screenshots here)
Flashing the drive
When the tablet boots into Ubuntu, connect the second USB drive that contains the Lamassu image to the tablet's blue (USB 3.0) port.
A dialogue box will ask if you want to open it in the file explorer. Click yes, then note the name of the drive shown at top. (example: 7C32-4A05 in the screenshot below.)
Pull up a terminal window with Ctrl Alt T. Run:
Then run the following command to flash the internal drive of the tablet, replacing DRIVENAME with the name noted in the file explorer, and adjusting for the 1103 or 1104 file name.
xzcat '/media/ubuntu/DRIVENAME/1104-351.img.xz' | dd of=/dev/sda bs=1M
It will not show an output until it's done, which could take between 15 minutes to an hour, after which the terminal will return to a new line.
Booting to the internal drive
Power off by tapping on the Ubuntu icon and selecting shutdown.
Remove both USB drives, then boot into the BIOS as before and ensure the internal drive (mSATA) is re-enabled and selected as default. Save and exit.
When fully booted, press the INIT button on the 'Congratulations' screen. Once initialised, create a new pairing code from your admin as you had done originally to pair the machine, press the Pair button and scan the pairing code.
The version contained on this machine image will be older than our latest release. Once paired to your admin, please use this article to retrieve the machine's device ID and contact support so that we may update your machine.