CYLINDER HEAD GP 4588438 - Caterpillar

Update Process
The PL421 and PL420 are updated Over-the-Air (OTA) only. There is no capability for updating the PL421 or PL420 Over-the-Wire (OTW) with Cat ET or WinFlash. Upon the request through a support case, firmware will be pushed OTA to the PL421 and PL420 Product Link system.Refer to the following tips on how to ensure Over-the-Air firmware update success:
Devices running firmware 2.1.9.2 or older must be in Full Power Mode (key switch ON) for at least 15 minutes in order to receive and process the update.
Devices running firmware 2.1.9.3 or newer must have unswitched power (main disconnect closed) in order to receive and process the update.
Devices must be in an area with adequate cellular coverage in order to receive and process the update.If a device has run in Full Power Mode twice after the final firmware update was scheduled and fails to process the update, contact VisionLink Support to have the update rescheduled.Note
This firmware update will prevent the reoccurrence of the issues listed above, but will not automatically correct the symptoms of certain issues that have already occurred. For example:
If a Product Link system has experienced the SMH jump issue, this firmware will prevent the issue from reoccurring, but the user may still need to send an SMH correction to the system from VisionLink.
If a Product Link system has reverted to the factory default VOC configuration, this firmware will prevent the issue from reoccurring, but the user may still need to contact VisionLink Support to have the device configuration corrected.
Product Link systems that need to be configured for DC R-Term will not be reconfigured automatically by the firmware update. The firmware update adds the support needed so the user can send a DC R-Term Configuration change from VisionLink to the system.