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Consequences and Precautions to Consider Before Deciding to Downgrade Firmware

Document ID:SO8017

Usergroup :External


Affected Products:

Single-Function: C4140, C6160, CS720, CS725, CS727, CS728, CS820, CS921, CS923, CS927

Multifunction: CX725, CX727, CX820, CX825, CX860, CX920, CX921, CX922, CX923, CX924, CX927, XC4143, XC4150, XC4153, XC6152, XC6153, XC8155, XC8160, XC8163, XC9225, XC9235, XC9245, XC9255, XC9265


Side Effects of Downgrading Firmware:

Downgrading or reverting firmware levels is not advised. Many reasons exist, for example:

Downgrading firmware from FW4... To a lower level, such as FW3...  Results in... 
CXTPP.040.072a PP.03x.yyy
  • Loss of installed non-native apps
  • Cleared configuration settings for built-in apps
  • Possible loss of certain functionality
  • Other unanticipated messages and errors

Firmware nomenclature (Naming convention).



  1. Do not downgrade firmware just because another device with lower firmware is working correctly. Escalate all issues with Lexmark's Technical Support team before deciding to downgrade firmware.
  2. You may have a PE-released version of firmware and this version may be more current than what is available on or the virtual solutions center VSC. Always check firmware levels found under Device Information.

  3. If using the ESF config tool to deploy/configure apps, do not select the 'install the firmware first" option unless you are absolutely certain the existing firmware on the device is outdated.


Device Recovery Steps:

Warning! Do not downgrade firmware, since returning the device's full compliment of features and functionality will require a multi-step process and will likely require contacting the solutions support team. 


Downgrading firmware

If necessary, and only as a last resort, if you are required to downgrade firmware, then you should follow this prelist and summary of steps to recover existing solution (apps) and configuration settings. 

Before you begin

  1. Create a list of all apps that are not pre-installed at the factory. 
  2. Capture all configuration settings for apps, e-mail, fax, copy, print, network, and security functions.
  3. Capture all user-defined shortcuts, profiles, and destinations.

Procedure: Downgrading firmware and sanitizing

  1. Downgrade firmware to the previous EC revision of firmware.
  2. When the printer returns to a ‘Ready’ state, you will need to access the printer's Embedded Web Server (EWS); i.e.,
  3. Navigate to Device > Maintenance.

  4. Select the following under Erase Printer Memory options:
  • Sanitize all information on non-volatile memory.
  • Start initial setup wizard.
  • Erase all printer and network settings.
  • Erase all apps and app settings.

  1. Click Start.

Reinstalling and activating apps

Upon completion, follow the steps in the setup wizard. Reacquire and reinstall all lost apps, licenses, certificates, and re-configure all user-defined settings.

WARNING! You will need apps specific to your code level since apps are code-level dependent. 

 Firmware Nomenclature:

Firmware level
Settings page (Base) Description
Firmware 4 (FW4 New!)

Offers better delineation of models: 


C = Color
M = Mono
T = Touch
N = Non touch

PP [CB, ATL, YK, MH] = Model ID



04 = Major release
0 = Minor release


Build number

01 = EC/PE release

29 = PE release

a – delta release

Firmware 3 (FW3) PP. 03x.yyy

PP – Model ID

03 – Major FW3 release.

x Level-3 delta.

yyy – Numeric build-level value.

As seen under Reports > Device > Device Information for PP.030.021 (FW 3.0.021):



Still Need Help?

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  • Printer model(s)
  • Printer serial number


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