This thread is being made to document the unpacking/decryption of XeniumOS for Open Xenium modchips.
Research may yield positive results, or we can discuss building a new OS for the devices based on existing Cromwell or XblastOS trees.
XeniumOS as of 2.0 is built around On-Time's RTOS32. The embedded webserver has a few things left behind such as a test.html accessable via HTTP, an uploadFrm that uploads to E.
http://<xbox-ip>/inproc/upldForm
http://<xbox-ip>/config.ini downloads your XeniumOS config
http://<xbox-ip>/background.jpg downloads the main background of the menu.