The way to install a new image for me has been:
- Hold down the Boot button and the Power button for around 3 secs. Don't hold it down longer or the board shuts off
- The device enters Maskrom Mode

Because the tool is 32bits you might have to install some extra packages.
This is what I needed to install in Debian 64bit to make "upgrade_tool" work:

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dpkg --add-architecture i386; apt-get update; apt-get install libstdc++5:i386 libpam0g:i386 lib32stdc++6

Paste the following in your Ubuntu or Debian environment to start the flash. Make sure you are in the directory with the right files.

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upgrade_tool ul MiniLoaderAll.bin \
 && upgrade_tool di -p parameter.txt \
 && upgrade_tool di uboot uboot.img \
 && upgrade_tool di trust trust.img \
 && upgrade_tool di misc misc.img \
 && upgrade_tool di resource resource.img \
 && upgrade_tool di kernel kernel.img \
 && upgrade_tool di boot boot.img \
 && upgrade_tool di recovery recovery.img \
 && upgrade_tool di system system.img \
 && upgrade_tool RD