Click to read the following changes in operation due to COVID-19.

Firmware Updates

ACCESS 2USB Firmware 4.5-p2

ACCESS firmware version 4.5-p2 is available for download. This firmware is installed by the user via the Device Manager application.


SPECIAL NOTE: If your ACCESS 2USB has a serial number lower than A2 6200, please contact our Tech Support department before updating.

Leer Primero

Download the 4.5-p2 Changelog

Firmware Download Contents:

  • ACCESS 2USB 4.5-p2 firmware file [.upd]
  • Device Manager application [.exe and .dmg]
  • Installation Instructions & readme [.txt]
  • ACCESS 2USB Manual and Addendum
  • HotSwap-Technote [.pdf]
  • Setup for MPLS [.pdf]
  • 4.5-p2 Changelog [.txt]

Click here for ACCESS Portable Classic firmware (Units with PCMCIA Slots)


Download ACCESS 2USB Firmware 4.5-p2

ACCESS 2USB Firmware 3.0p13

SPECIAL NOTE: If you updated your ACCESS 2USB and received an incompatible message on your ACCESS 2USB screen, please revert to the older firmware by downloading the 3.0p13 firmware package. Use Device Manager to update your firmware back to 3.0p13.

Download ACCESS 2USB Firmware 3.0p13

Comrex Version Security Concerns and Firmware Fixes


Professional IP Audio Codec Compatibility

Download File

What is CrossLock?

Download File

4.0 firmware FAQ

Download File

ACCESS 2USB Wi-Fi Setup for 4.0 firmware and newer

Download File

Differences between Fleet Commander, Codec Commander and Switchboard

Download File

Making the Transition from ISDN to IP

Download File

Smartphone Apps for use with Comrex Audio Codecs

Download File

Linphone Technote

Download File



The Comrex ACCESS Portable is a remote broadcast tool that provides utility and portability, but has limited audio I/O built-in. The portable includes one mic/line adjustable input on XLR, one stereo line level input on mini jack, and a headphone and line-level stereo output on mini-jack.

The ACCESS Portable Mixer accessory was designed to address these limitations for applications that require multiple audio I/O for remote broadcasts. The unit “docks” to the ACCESS Portable and expands the audio I/O to five mic/line selectable XLR Inputs and five stereo Headphone Outputs on 1⁄4″ jacks. All ACCESS Portable audio connectors remain active during use of the Mixer, so the total number of Input/Headphone connector pairs increases to six.

Read More!

Comrex Connect Modems

Cellular wireless data connections like 3G and 4G LTE have redefined the way remote broadcasts are done. In particular, USB cellular modems make connecting to these networks fast and simple. But the number of USB cellular data devices offered by cell phone providers is dramatically decreasing in favor of cellular Wi-Fi Hotspots. Additionally, many of the off-the-shelf modems offered by carriers are not designed to meet the rigorous demands of the 24/7 news cycle.

Comrex designed the Comrex Connect Modem to support the unique needs of remote broadcasters. A high-powered, industrial strength 4G/LTE modem, the Connect Modem is also 3G compatible. Outfitted with a high-gain antenna, the Connect Modem is more powerful than most USB data modems available on the market, to handle the heavy data load of an IP audio broadcast.

The Connect Modem INITIALLY came in four varieties to support connections to Verizon, AT&T, International (for outside of US), and CJ (for use in China, Japan, Taiwan, Korea, and Brazil) networks, and was PTCRB and carrier certified to meet all necessary regulations. It was also specific for ACCESS Portable Classics and 2USBs.

As of July 2020, the ACCESS Connect Modem comes in three varieties (VZW/ATT, International, and CJ). The NEW Connect Modem for ACCESS can work with ACCESS 2USB, ACCESS NX, ACCESS Rack, ACCESS NX Rack, ACCESS MultiRack, and BRIC-Link II (when used with HotSwap).

Read More!

VZW/ATT Comrex Connect modems purchased after 7/1/2020 will only work on units with FW 4.5p3 or higher.

Access 2USB units with SN#’s between 5000 – 6200 may require a hardware upgrade to be compatible. Contact us with your serial # for further information.

Comrex Connect Modem EXT

Leverage the power of two Comrex Connect Modems with your ACCESS codecs for twice the reliability. ACCESS Connect Modem EXT includes one modem and an extended bracket. AT&T, Verizon, and International versions are available.

Read More!

Extra Small Case

Watertight, crushproof, and dust proof to ensure the best protection for your ACCESS Portable.

Exterior Dims:
L 15.4″ x W 12.1″ x H 6.8″

Contact a dealer to purchase

Small Case

Durable travel case, perfect for carry-on or shipping. Mixer cutout. Multiple foam inserts available.

Exterior Dims:
L 19.5″ x W 16″ x H 8.25″

Contact a dealer to purchase

Large Travel Case

Durable road case with rolling wheels and retractable handle.

Exterior Dims:

L 25.4″ x W 19″ x H 14.25″

Contact a dealer to purchase


Stand-alone Rapid Charger


Perfect stand-alone charger for your ACCESS Portable batteries.

12V DC Adapter


Serial Cable


DB9F to mini-DIN 8M.

Contact Closure Cable


DB9M to mini-DIN 9M.

Spare Battery


ACCESS 2USB Power Supply


IEC Power cord not included.

Power Cord (IEC Socket)


Dock cover for Mixer port




Strap Bracket


Qty 1.  Order 2 if needed.



Wi-Fi Adapter (International)


Wi-Fi Adapter (Domestic)



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