Subaru Retailers

To:
All Subaru Retailers
From:
Subaru of America, Inc. – Service & Quality Department
Date:
December 15, 2020
Re:
Denso Gen 4 CP1 Software Update Warning
We have learned during software update validation, the number of files required to complete the update for 20MY
and 21MY is not the same. This detail is outlined in the WRI-20 Service Program bulletin as it applies to both 2020 and
2021 MY Legacy and Outback.
There are 4 (FOUR) FILES required to complete the Denso CP1 Audio/ Navi software update for 2020MY Legacy and
Outback.
For 2021MY Legacy and Outback, there are only 3 (THREE) FILES required.
ALL 4 (or 3) update files MUST BE DOWNLOADED TOGETHER to the USB Flash Drive before starting the update.
CRITICAL: PERFORMING THIS UPDATE USING A USB FLASH DRIVE WITH ANY OF THE REQUIRED UPDATE FILES MISSING
WILL LEAD TO A NON-RECOVERABLE FAILURE OF THE COCKPIT CONTROL MODULE (CCM) REQUIRING CCM
REPLACEMENT.
Example for 20MY- Copy these 4 files to the update USB
Example for 21MY- Copy these 3 files to the update USB
Given the size of the software update files, almost 7GB for High grade (model with Navigation), it is important to
confirm the PC has enough memory space (at least 16GB free space) to support the compressed files size.
Similarly, the USB Flash drive must be a minimum of 16GB in size.
Always follow WRH-20 “Rear Visibility FMVSS 111 Non-Compliance”, WRI-20 “Reprogramming of Denso CP1
Infotainment Units to Optimize System Performance” or TSB 15-261-20R “Reprogramming File Availability for
Optimization of Gen 4 Denso CP1 Infotainment Systems” as applicable for minimum memory space requirement, other
cautions and helpful tips to assist with the update process.
If any concerns are experienced during the software update process, please submit a detailed QMR with all available
facts and contact the SOA Technical Helpline if immediate assistance is required. Be sure to include screenshots of any
messages displayed as well as a screenshot of the file tree showing the files installed and system details including
available memory etc. If possible, include a video of the concern as duplicated and any steps required to duplicate it.