How to revert your ChallengerPlus to a Challenger10 Please refer to the Firmware Upgrade Field Notes when attempting a firmware upgrade. You will need to download CTPlus from the Carrier Fire & Security website before you can proceed with installation and setup. Upgrading from Challenger10 to ChallengerPlus can be done from within the CTPlus (v2.1) software, available from the Carrier Fire & Security website.įirmware is available via CTPlus (installer software). Existing Challenger10 customers can protect their hardware investment and upgrade to a ChallengerPlus, to take advantage of the modern features and functionality that the new ChallengerPlus delivers.