Restoring remote updater ability (Trofa)

Background

Due to an expiring server certificate, a file will need to be replaced on the machine in order to restore the ability for our support team to remotely update, reboot, unpair, and pull logs from machines.

Operator-controlled remote reboots are still functional on supported versions. (See 'Remotely rebooting the machine')

The following procedure is for Nexus-based (7" screen) Trofa machines. For the 10" Aaeon-based Douro models, follow the article here.

Equipment needed

Small pliers, wrench, or nut driver to remove 7mm nuts; microUSB cable, Windows-based PC (Mac/Linux instructions to come).

Steps

1. Download the sencha-system-cert-0.5.20-2.img and adb-setup-1.2.exe files to a Windows computer.

2. Behind the door of the Trofa machine, locate the four nuts affixing the retaining bracket of the Nexus tablet. Unscrew these and remove the tablet, carefully unplugging its USB cable.

3. Connect the tablet via a micro USB cable to the computer. Once connected, simultaneously hold down the power and volume down buttons on the side of the tablet, continuing to hold through its reboot until it arrives at a black screen with a green Android logo.

4.  Run the adb-setup-1.2 installer, typing Y and Enter at the two prompts (see video below). After installation, open up a Windows command window (Start > Run > cmd). Type fastboot devices and hit enter. If the tablet is recognized, you'll see a string of numbers/letters followed by 'fastboot'.

5. Run the following, replacing C:\path\to\sencha-system-cert-0.5.20-2.img with the location of the image file on your computer. You can get this by dragging and dropping the image file onto the command window after typing the preceding command (see video):

fastboot flash system C:\path\to\sencha-system-cert-0.5.20-2.img

6. It will take about a minute to flash, finishing with 'Success'. If you receive a 'Failed' message, try a different brand USB cable and port on your computer.

7. After a successful flash, replace the tablet in the machine and reboot. Reach out to us to confirm that we now see the machine pinging.

Video example

Potential issues

If the tablet goes to a fully teal screen after the update, reflash the tablet following the instructions for our generic image instead and then contact support for remote updates to the latest version.