This article explains how to troubleshoot the W09 Current Software Not Up To Date warning on an Aventon eBike.

Use this article if your bike:

• Shows a W09 warning code
• Displays a software update warning
• Has trouble connecting to the Aventon App
• Has firmware that may not be up to date

If you are unsure of your Aventon model, please confirm your model before continuing.

Stop troubleshooting immediately if anything looks unsafe or if the bike behaves abnormally during updates.

Before You Start

Please prepare the following:

• Order number
• Aventon model
• Photo or video of the W09 warning code
• Screenshot of the Aventon App version
• Screenshot of any firmware update prompts
• Whether the bike powers on
• Whether the display turns on
• Whether the bike connects to the Aventon App
• Whether the issue happened after an app update, firmware update attempt, transport, storage, water exposure, modification, or third-party repair

Safety Warnings

• Do not disconnect the battery or power off the bike during a firmware update.
• Do not work on wiring while the bike is powered on or charging.
• Stop and contact support if you are unsure.
• Ensure the battery has sufficient charge before starting updates.

What This Warning Means

The W09 Current Software Not Up To Date warning means the bike software or firmware is not up to date.

The bike may require:

• An updated Aventon App
• Updated electrical firmware

Possible Causes

Possible causes include:

• Current software is not up to date
• Outdated Aventon App
• Outdated electrical firmware

Troubleshooting Steps

Step 1 – Update the Aventon App

Check that the Aventon App is updated to the latest version on your mobile device.

Install any available updates for the app.

If yes – The Aventon App is updated

Continue to Step 2.

If no – The Aventon App was outdated

Update the app to the latest version.

After updating:

• Reopen the Aventon App
• Continue to Step 2

If the issue clears

The issue was likely caused by outdated app software.

Continue monitoring the bike and app during normal use.

If the issue remains

Continue to Step 2.

Step 2 – Reconnect the eBike to the Aventon App

Reconnect the eBike to the Aventon App.

Check whether:

• The bike connects successfully
• The W09 warning remains

If yes – The W09 warning still appears

Continue to Step 3.

If no – The warning clears

The issue was likely caused by a temporary app or connection issue.

Continue monitoring the bike during normal use.

If the issue clears

Continue normal use and monitor the bike.

If the issue remains

Continue to Step 3.

Step 3 – Update the Electrical Firmware

Using the Aventon App:

• Check for available firmware updates
• Update all electrical firmware on the eBike to the latest version

Allow the update process to complete fully.

Restart the bike after the update.

If yes – The W09 warning still appears

The issue may involve the bike firmware or communication system.

Please contact our support team with the photos/videos listed below so we can review the next step.

If no – The warning clears

The issue was likely caused by outdated firmware.

Continue monitoring the bike and app during normal use.

Step 4 – Check App and Bike Communication

Check whether:

• The bike stays connected to the Aventon App
• Firmware updates complete successfully
• The display operates normally
• The W09 warning returns

If yes – Problems continue

The issue may involve:

• Firmware communication
• App connection
• Electrical firmware updates

Please contact our support team with:

• Screenshots of the app
• Screenshots of update messages
• Photos of the display and warning code

If no – Everything operates normally

The issue was likely resolved during the update process.

Continue monitoring the bike during use.

When To Contact Support

Please contact support if:

• The W09 warning remains after completing these steps
• The bike will not connect to the Aventon App
• Firmware updates fail repeatedly
• The display behaves abnormally
• The bike has been exposed to water, crash, impact, transport damage, modification, or third-party repair
• You are unsure how to safely complete a step

If the issue remains after these steps, please contact our support team and include the photos/videos listed below.

What To Send Support

Please send:

• Order number
• Aventon model
• Photo/video of the W09 warning code
• Screenshot of the Aventon App version
• Screenshot of firmware update messages
• Photo of the display
• Confirmation of whether the bike powers on
• Confirmation of whether the display turns on
• Confirmation of whether the bike connects to the Aventon App
• Confirmation of whether firmware updates complete successfully
• Confirmation of whether the issue happened after an update attempt, water exposure, crash, impact, modification, or third-party repair
• Confirmation of the troubleshooting steps already completed

Important Safety Notes

• Do not disconnect the battery or power off the bike during firmware updates.
• Do not continue using the bike if it behaves abnormally after an update.
• Do not open the battery, controller, display, or sealed electrical components.
• Do not work on wiring while the bike is powered on or connected to the charger.
• Contact support if you are unsure.