SIERRO

Sierro 1000 / Sierro 2000

Sierro Firmware Update Guide

Install the latest Sierro app first, then update your device firmware for the latest controls, charging behavior, and fan performance.

Last updated October 17, 2026

Start the update guide

Before you start

Keep power and Wi-Fi steady.

  • Keep AC input connected throughout the update.
  • Charge the device to at least 60%.
  • AC output will be interrupted during the update.
  • Power your router and essential equipment from another source.
  • Allow about 15–30 minutes for a two-part update.

  1. Update the Sierro app

    Install Sierro app version 4.27.0 or later from the App Store or Google Play, then reopen the app.

    Updating the app does not update the device firmware. Continue through the remaining steps when the app offers a firmware update.

    Update the app first, then reopen it.

  2. Find your device update

    A reminder may appear when you reopen the app. Tap Review Update. If your device is offline, reconnect it before checking—offline does not mean up to date.

    If you do not see the prompt

    From Settings Settings → Support → Firmware Update → select your device
    From your device Device Settings → Firmware Update
    What the status means
    Update available
    Tap the device to review the update.
    Up to date
    No update is currently offered for that device.
    Offline
    Reconnect the device and check again. Offline does not mean up to date.
    Firmware Update device list showing Update available, Up to date, and Offline statuses
    Tap the device marked Update available. Open the image to enlarge.

  3. Final check before Start Update

    Confirm the update details, tap Continue, read the interruption warning, then tap Start Update.

    • AC input is connected
    • Wi-Fi is stable
    • Battery is at least 60%
    • The offered firmware is for this device
    Firmware Update checklist showing battery, Wi-Fi, appliance, and interruption requirements
    Check every requirement, then tap Continue. Open the image to enlarge.

  4. Complete every part

    Keep the app open on the update screen during preparation and download. The safest option is to leave it open until Update Complete appears.

    Do not restart Sierro or your router. Leave the update screen only if the app explicitly says it is safe to do so.

    For a two-part update, return to the app for Part 2 and wait until all parts finish.

    Sierro app showing Part 1 of 2 while firmware is updating
    Keep the app open through every update part. Open the image to enlarge.

  5. Check power after completion

    Tap Done, check the device’s AC output control, and turn AC output on if needed. Confirm that connected appliances receive power and work normally.

    Follow any restart instruction shown in the app for your model.

    Sierro app Update Complete screen with Done button
    Wait for Update Complete, then tap Done. Open the image to enlarge.

Part 6

If the update does not go as expected

What you may see

The update will not start

Confirm AC input and network connectivity, then tap Try Again. Check that the battery is at least 60% and that the device is online in the app.

Unable to Start Update screen with Try Again button
This is the Unable to Start Update screen. Tap Try Again after checking power and connectivity.

Troubleshooting

The update is taking longer than expected

A slow or unstable Wi-Fi connection may delay the update. This doesn’t necessarily mean the update has failed. Keep Sierro powered on and connected to AC power and Wi-Fi. Stay on the update screen and follow the instructions in the app. Do not restart Sierro or your router.

The app says the update failed

Keep Sierro powered on and connected to AC power and Wi-Fi. Do not restart Sierro or your router.

If Get Help appears, tap it to submit a support request. If the option is unavailable or the request cannot be sent, email Sierro Support with your device model, serial number, app version, a screenshot of the error, and the approximate time it occurred.

Wait for guidance from Sierro Support before restarting the device or attempting another update.

Update Failed screen with Get Help button
Tap Get Help.
Firmware Update Support request form
Review the details and submit the support request.