You can download the Pibox v3.4 here:
\\ https://p-node.org/pibox_img/pibox4_shrink.img.xz

To decompress the .xz archive, you'll need to use an utility on
your operating system or download one.

You'll get an .img image that you'll need to flash onto a micro SD
card. To do this, use :
\\ https://etcher.balena.io/
\\ You can also use your preferred utility for this purpose.

//Note: it is recommended (but not mandatory) to use a micro SD card with
a minimum capacity of 16 GB, such as a SanDisk Ultra or higher.//

Once the image has been flashed, remove the micro SD card from your
computer and place it in your Raspberry Pi. Plug in the Raspberry Pi.
It will take a few tens of seconds to boot up for the first time.

Tested on :
  * Raspberry Pi 3B+ (with and without extra USB wifi dongle).