The following firmware update (v 1.7) was released in 2011 for the iDVR-E4, iDVR-E8, and iDVR-E16 model surveillance DVRs.
http://videos.cctvcamerapros.com/downloads/firmware/iDVR-E/iDVR-E_1.7_011911.img
Here is an installation guide that can be used after the firmware image is downloaded and copied to a USB thumb drive:
http://videos.cctvcamerapros.com/downloads/firmware/iDVR-E/iDVR-E-Firmware-Update-Instructions.pdf
