the voice on my roomba combo j9+ is suddenly in a different language and i can't figure out how to change it back.

Diagnosis

The iRobot Roomba Combo j9+ does not have an onboard physical interface for language selection. Instead, it utilizes a cloud-sync mechanism where the voice profile is dynamically assigned based on the regional settings of the linked iRobot Home app and the primary smartphone's OS language. If the robot is suddenly speaking a different language, it is typically due to a "sync drift" where the app's regional preference was accidentally toggled, or a firmware update triggered a reset to the default factory language (usually English US) which may conflict with your specific regional dialect settings. This issue can also be triggered if multiple users are linked to the same robot via the app. If a secondary user logs in from a device set to a different language, the robot may occasionally adopt those settings during the last handshake. To confirm this is a software sync issue and not a hardware malfunction, check if the robot still responds to voice commands in the "wrong" language; if it does, the internal logic is functioning, and only the audio output profile is mismatched.

How to Fix It

To reset the voice language on your Roomba Combo j9+, follow these precise steps within the iRobot Home app. Note that you cannot change the language via a simple dropdown menu on the robot's main page; it requires a deep dive into the device settings.

1. Launch the iRobot Home app on your primary mobile device. Ensure you are logged into the account that acts as the primary administrator for the j9+.
2. From the home dashboard, tap the Robot icon or the three-line hamburger menu located in the top-left corner of the screen.
3. Navigate to Robot Settings (represented by a gear icon).
4. Scroll down to the Voice & Sound section.
5. Locate the Voice option. If the language is grayed out or locked, you must first verify your Country/Region settings in the Account profile section.
6. Select your preferred language from the list (e.g., English - United States).
7. Once selected, you must manually trigger a sync. The easiest way to do this is to press the "Clean" button on the robot's physical top panel or start a "Clean" cycle via the app. This forces the robot to ping the iRobot servers and download the updated voice pack.
8. Wait approximately 30 to 60 seconds for the robot to acknowledge the change with a confirmation chime.

If That Didn't Work

• Perform a Soft Reboot: Press and hold the "CLEAN" button on the top of the j9+ for 20 seconds until the light ring swirls. This clears the temporary cache and forces the robot to re-fetch its configuration profile from the cloud, which often resolves language sync errors.
• Check Smartphone System Language: Go to your phone's system settings (iOS Settings > General > Language & Region or Android Settings > System > Languages). If your phone is set to a secondary language, the iRobot app may override the robot's settings. Set your phone to the desired language, restart the app, and the robot should auto-update.
• Remove and Re-add the Robot: In the app, go to Robot Settings and select "Remove Robot." Perform a factory reset on the j9+ by holding the "CLEAN" button until the light ring flashes. Then, go through the "Add Device" process again. This creates a fresh handshake between the hardware and the cloud server, resetting the voice profile to the current app default.
• Update Firmware: Check for a pending update in the app. If the robot is running an outdated version of the firmware, it may struggle to communicate with the voice-pack servers, causing it to default to a generic language.

Heads Up

• Avoid Multiple Admin Accounts: If you have shared the robot with family members, ensure all linked accounts are set to the same region to prevent the robot from switching languages based on who last triggered a command.
• Wi-Fi Stability: Voice packs are downloaded over Wi-Fi. If your signal is weak near the Clean Base, the robot may fail to download the new language pack, leaving it in the previous (incorrect) language.
• Firmware Interruptions: Never turn off the robot or remove the battery during a firmware update, as this can corrupt the voice synthesis files, leading to distorted audio or "robotic" sounding speech.