Call4tel

How to Rebuild the OS in Your NX Device

Restore an NX device by downloading a 3CX Debian image, creating a bootable USB with Rufus, and performing a fresh OS installation.

  1. Download Debian 10 or Debian 12 from 3CX's official download site.
  2. Create a bootable USB drive using Rufus.
  3. Connect the USB, an HDMI monitor, a network cable to the WAN port, and power.
  4. Press Esc during startup and select the USB as the boot device in BIOS.
  5. Select the 3CX installer file and press Enter, then choose Install.
  6. Enter hostname/domain (optionally a static IP), then choose language, location, and keyboard layout.
  7. Set and confirm the root password.
  8. Choose "Guided – use entire disk," select the virtual disk, and write all files to one partition.
  9. Select 3CX System, accept the license agreement, and let installation finish.
  10. Over SSH, run the Call4tel portal installation scripts to finish setup.