APC ACRP500 User Manual

Upgrading the firmware on the cooling unit has the following benefits:

•  New firmware has the latest bug fixes and performance improvements.
•  New features become available for immediate use. 
•  Keeping the firmware versions consistent across your network ensures that all cooling units 

support the same features in the same manner.

A firmware version consists of two modules: An APC Operating System (AOS) module and an 
application module. Each module contains one or more Cyclical Redundancy Checks (CRCs) to protect 
its data from corruption during transfer.

The AOS and application module files used with the cooling unit share the same basic format:

apc_hardware-version_type_firmware-version.bin

• apc: Indicates that this is an APC file.

• hardware-version: 

hw0

 identifies the version of the hardware on which you can 

use this binary file.

• type: 

aos

 if the file is the AOS module, or 

acrp 

if the file is the application module for 

the cooling unit.

• firmware-version: The version number of the file. 

•

bin

: Indicates that this is a binary file.

An upgrade tool automates the 

transferring of the firmware modules on any supported Windows operating system. Obtain the latest 
version of the tool at no cost from www.apc.com/tools/download. At this Web page, find the latest 
firmware release for your APC product and download the automated tool. Never use the tool for one 
APC product to upgrade the firmware of another product.