17tdt1eu-da31 Software Update !!top!! — Must Watch

If you encounter any bugs or issues after updating to build 17tdt1eu-da31, please leave a comment below or open a support ticket with your system logs attached.

Download the official firmware files from the Toyota Firmware Portal or the Global Infotainment System Portal . Format a blank USB drive to . Copy the update files to the root of the USB drive.

Some hardware revisions (da31 suffix denotes a hardware change) may be incompatible with older firmware. Check your board’s silkscreen. 17tdt1eu-da31 Software Update

Updating car firmware is more sensitive than updating a smartphone. It requires a stable power source—usually meaning the engine must be running—to ensure the system doesn't shut down mid-transfer, which could "brick" the unit. Preparation:

Before attempting to install the 17TDT1EU-DA31 patch, verify that you actually need it. If you encounter any bugs or issues after

: Fixes intermittent issues where the Bluetooth connection might drop or fail to reconnect.

| Version | Filename | Release Date | Notes & User Feedback | |---------|-----------------------|------------------|---------------------------------------------------------| | | (not determined) | Mid‑2020 | First update that enabled Android Auto / CarPlay; often a transitional version. | | v1075 | 17TDT1EU-DA31_0076.kwi | Mar 2020 | “Improved stability and various bug fixes”; many users reported this version works reliably. | | v1101 | 17TDT1EU-DA31_0036.kwi | Nov 2020 | Also labelled “System: Improved stability, Various bug fixes – Audio Audio update 01101”. | | v1139 | (filename not public) | Dec 2020 | Minor update; some users encountered installation failures on certain hardware batches. | | v1170 | 17TDT1EU-DA31_0076.kwi (sic) | Apr 2021 | The last known public release for 17TDT1EU-DA31. | Copy the update files to the root of the USB drive

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Keeping your Toyota DCU updated fixes several chronic bugs reported by drivers across various automotive forums:

After updating, some owners on forums have reported encountering specific issues: