EON ONE MK2 Firmware Update Fix: JBL Pro Connect App Workaround for iOS 26
Technical Support Guide
Table of Contents
FIRMWARE UPDATE BUG
We have identified a bug when attempting to update the firmware on the EON ONE MK2 with version v5.0.9.0 using iOS 26.
We are actively working on a permanent fix. In the meantime, you can use the following workaround.
Alternatively, the firmware update can be completed successfully using an Android device, with no workaround required.
Brand:
- JBL
Models:
- EON ONE MK2
Overview:
This article provides troubleshooting steps to help prevent a firmware update failure on the EON ONE MK2 when using an iPhone or iPad running iOS 26 to update the speaker from firmware version v5.0.9.0 to version v5.3.2.0.
A) Establish a new connection.
- Go to iPhone/iPad Settings > Bluetooth Settings, find the EON ONE MK2 speaker, and select Forget This Device.
- Uninstall the JBL Pro Connect app.
- Factory reset the speaker.
Factory Reset Procedure for the EON ONE MK2 Column Speaker - Reinstall the JBL Pro Connect app and proceed with BT Control Pairing.
JBL Pro Connect App | Bluetooth Control Pairing
B) Firmware Update
- Start Firmware Update on JBL Pro Connect App.
Updating Firmware With the EON ONE MK2 Column Speaker
- Once JBL Pro Connect app is opened, it will automatically detect that a firmware update is required.
Press the “Refresh” Icon to start firmware update.
- Press “CPU” Icon to start the firmware update to v5.3.2.0 in the app.
Bluetooth pairing request will be displayed, select Pair.
- Monitor the progress bar. After it reaches 100%, it will remain at that point for approximately 15–20 seconds before completing update.
Timing is Crucial
As soon as the status changes to "Rebooting the loudspeaker…,"
Immediately force-close (swipe away) the JBL Pro Connect app.
C) Reconnect your Speaker
- Go to iPhone Settings > Bluetooth and Remove/Forget the EON ONE MK2 speaker again.
- Re-open the JBL Pro Connect app and wait for the "Bluetooth Pairing Request" pop-up, select “Pair”.
NOTE:
Immediately after selecting “Pair”, the speaker LCD will turn OFF and will finish rebooting.
If the speaker's LCD remains on after selecting "Pair," the process was not completed correctly.
- Once the speaker has rebooted, verify that the unit has been updated successfully to the latest firmware version.
After confirming the update is complete, perform a factory reset on the unit.
Ready to use.
You can now proceed to normal operation as if the speaker was new out of the box.
JBL Pro Connect App | Bluetooth Control Pairing Pairing Bluetooth Audio With Your EON ONE MK2 Column Speaker