OWNER ANSWER

BYD software updates: how to check and install in the UK

For a BYD software or firmware download, start with the update offered on your car’s version screen, or the BYD app where your vehicle supports it. Use the model-specific route below, read the offered release and follow its battery and connection requirements before installing.

Park safely in P with the stable connection required by your update.
Use the model-specific route below to open the offered release. Safety note: An active installation must stay parked and uninterrupted. Keep third-party OBD devices disconnected; unofficial firmware, a factory reset or battery disconnection can disrupt the update. Leave a car with abnormal brake, ABS or power-system warnings stationary and seek BYD recovery advice.
Prepare the battery before starting: original ATTO 3, EVO and original SEAL handbooks specify fully charging; ATTO 2, DOLPHIN, SEAL 2026 and SEALION 7 call for high/sufficient charge, and SURF for sufficient power.
Read the offered release notes and choose immediate or scheduled installation.
Leave the car unused for the displayed installation period; charging and discharging are unavailable.
After confirmed completion, check the new version and normal operation before driving.

Where is the firmware download?

The original SEAL and SEALION 7 handbooks describe OTA updates: the car prompts you when an update is available. Follow that offered update rather than choosing a file because its version number looks newer. MyBYD’s release library explains published updates; it is not a source of firmware installation files.

If nothing is offered, compare the full version and exact model with the relevant release record. If you need BYD to check availability for your vehicle, give its support team the full version shown on screen and ask whether any action is required. An update listed for another model is not an installation instruction for your car.

What to expect

The car reports installation complete, the version screen matches the completed release and essential controls operate normally. A returning offer, explicit failure or abnormal brake, ABS or power warning needs the branch below.

If that did not work

If no release is offered, check the release for the exact model rather than reinstalling the phone app. After an explicit installation failure, use the official retry once its conditions are met; a repeat failure or unrecovered essential control needs BYD. Use the stalled-update guide below.

Find the right version screen

ATTO 2 EV: Vehicle settings → System → Version → Version update. Original ATTO 3: Vehicle settings → System → Version → Software Version → Upgrade. ATTO 3 EVO: Application centre → System → Version update. DOLPHIN: Vehicle settings → System → Version → Version update → Upgrade.

SEAL, SURF and SEALION 7 menus

Original SEAL: Vehicle settings → System → Version → Software Version → Upgrade. SEAL 2026: Vehicle settings → System → Version → Version Update. DOLPHIN SURF: Vehicle settings → System → Version → Vehicle Version → Version Update. SEALION 7: Vehicle settings → System → Version → Vehicle Version → Upgrade. Match the actual screen if labels have changed.

Can I use the BYD app?

Original ATTO 3, EVO and original SEAL describe a mobile-phone option; SEAL 2026 and SEALION 7 qualify it as supported equipment. SURF describes BYD Auto App → main interface → More Functions → OTA Upgrade, with menu variations possible. The cited ATTO 2 and DOLPHIN sections give the touchscreen route. Use the correct bound vehicle and the update actually offered.