The Tune Delivery Network (TDN) is a cloud storage service for tune-related files.

• It's created and maintained by HP Tuners, and is only compatible with specific types of HP Tuners files.

• All TDN files are stored remotely on a secure server.

• Like other cloud storage services, you can only see files associated with the account you're signed into.

• You can invite others to view and share files by "linking" them in the TDN App (our invite code is TFWP-6913).

• TDN files are pushed to / pulled from the cloud by "syncing" them in the TDN App.

The TDN App provides secure access to the TDN, and directs your tuning device on what to do.

• Free for Android and iOS

• It's created and maintained by HP Tuners, and is only compatible with specific types of HP Tuners files, devices, and vehicles.

• The App establishes a secure connection with TDN Servers and provides you (and us) with access to tunes and data logs, vehicle diagnostic information, and more.

• Creating and signing into an HP Tuners Account is required to use the TDN App, as the app needs to know which account on the server to access files for.

• You can invite others to view and share files with your TDN Account by "linking" them as your tuner to your account in the TDN App.

• The app communicates with your vehicle through a tuning device, and communicates with TDN servers through an active internet connection (Wifi or cellular data).

• The app uses secure authorization to sync files to and from TDN servers when...

  • Importing files from your device to the TDN.

  • Receiving files from a linked tuner to the TDN.

  • Exporting files from the TDN to your device.

Most problems can be fixed by uninstalling and re-installing the TDN App.

Any time you have an issue with the TDN App or your device, we encourage you to try the solutions outlined below. You'd be surprised how many issues are related to the device rather than the App!

If none of the solutions below resolve your issue, please let us know. For fastest service, please include the following information with your inquiry:

• At least one previous order number

• Device model & generation (e.g., RTD+, RTD4, MPVI3)

• A brief description of the issue with screenshots if possible

• An info log (TDN App > Tools > Gather Info Log for Tech Support > Share)

Please note: We will make every effort to assist you within our capabilities. However, you may need to submit a help ticket with HP Tuners. HP Tuners also offers live support during normal business hours. To initiate a live chat, please click "Connect With Us" at the previous link.

Other Fixes:

• Check that you are still logged in to your TDN Account (TDN App > Account)

• Re-sync your device (TDN App > Tools > Resync)

• Check for updates (through the App Store and within the TDN App) (TDN App > Tools > Update Firmware, Update Bluetooth Firmware, Update Resource files)

• Check that your phone has granted appropriate permissions to the TDN App (TDN App > Tools > Set App Permissions)

• Re-try First Time Setup (TDN App > Setup Device)

Specific Issues:

Files not displayed / missing files:

• Ensure that you are logged into the correct TDN account (reference previous emails from TDN, or Tune Delivery Network)

• Sync Files (TDN App > Flash > Vehicle Folder if applicable > SYNC FILES button)

Required Update for iOS Users (see image below)

If we’re unable to locate your TDN account, it’s usually due to one of the following reasons:

1. Incorrect Email or Login Info Double-check that the email address you entered on your TDN Request is the same email address you used for your TDN account (TDN App > Account).

2. Multiple Accounts If you’ve used different emails or devices, you may have unintentionally created multiple accounts. Try logging in with any alternate email addresses you may have used.

3. Account Not Yet Created If you haven’t logged into the TDN App before, your account may not exist. You’ll need to create an account in the TDN App to get started.

4. Tuner Not Linked Please be sure that ZFGR is linked as your tuner - our invite code is TFWP-6913 (TDN App > Account > Link Tuner).

Once you have corrected any of the above items, please submit a new TDN Request in Tuning Central.

If HP Tuners recently released support for your vehicle (e.g., 2025 Explorer, Bronco, Bronco Raptor, Ranger, Ranger Raptor, 2023+ F150, etc.), you may encounter an error message when trying to read the stock file. This is expected in some cases and can be resolved by recording a 5-minute data log of idle in lieu of the stock file. Please be sure to submit a request in Tuning Central once you have verified that the file is synced.

Steps to Record and Submit a Data Log:

1. Connect your device to the vehicle's OBD-II and start the engine

2. Open the TDN App and tap Data Log (paper icon)

3. Tap START and wait for the gauges to appear

4. Let the vehicle idle and continue recording for 5 minutes

5. Tap STOP to end the data log

6. The app will process the log and display a list of files. - If you don’t see the file list, go to Data Log > View & Sync Files - Make sure the file is synced (See: Checking for Synced Files)

7. Once synced, submit a TDN Request for Stock Calibration in Tuning Central

IMPORTANT: All other steps in the tuning guide should still be followed exactly as instructed.

For customers with other vehicles (pre-2021 F150, Explorer, Edge, etc.) -

1. Please ensure that a tune is not already on the vehicle.

2. If the stock file is on the vehicle and the error persists, please contact sales@tunedbyzfgracing.com and include: - Your order number - Vehicle year, make & model - An Info Log (TDN App > Tools > Gather info log)

If your file (e.g., a data log or stock file like "Restore") displays an icon with an arrow and no green checkmark, it means the file is not synced to the TDN server. This will prevent your tuner from accessing the file.

To sync the file: Please provide power to your device via OBD-II with key on/engine off, or via USB-C on the front of your device. Then, open the TDN App and navigate to the file you're trying to send. Now click "SYNC FILES" at the bottom of the screen.

Be sure to submit a NEW request in Tuning Central if you received an email from Calibrations stating that your file was not synced.

Yes, please check that the file is synced then submit a request for Stock Calibration in Tuning Central.

Instructions for syncing files are found in the TDN App FAQ [direct link to this FAQ].

Yes, syncing alone does not automatically alert us that a file is ready. Please submit the appropriate request for Stock Calibration in Tuning Central.

This could be due to:

• Poor internet connection

• App not updated

• Server delay

Try restarting the app or checking your internet connection. If the issue persists, contact sales@tunedbyzfgracing.com

If your TDN App shows a blank screen or no tunes/files, try the following steps:

1. Check Your Internet Connection A weak or unstable connection can prevent the app from loading your files. Make sure you're connected to Wi-Fi or mobile data.

2. Refresh the App Close and reopen the TDN App. This often forces a refresh and reloads your synced files.

3. Tap “SYNC FILES” If your files haven’t been synced yet, they won’t appear. Tap the “SYNC FILES” button at the bottom of the screen to upload/download any pending files.

4. Log In (With the Correct Account) Make sure you’re logged into the TDN App, and that you're using the correct login/username. Files are tied to your account.

5. Update the App Ensure you’re using the latest version of the TDN App. Outdated versions may have bugs or syncing issues.

6. Re-Install the App If you haven't used the TDN App in a while, there's a chance that you need to uninstall and re-install it completely. Once re-installed, please sign in (see #4 above) and sync files again (step #3).

7. Still Not Working? If none of the above steps work, contact sales@tunedbyzfgracing.com for help! For fastest processing, please include your order number(s). There may be a server-side issue or account mismatch.

Any file that your tuner needs to review—such as data logs or stock files ("Restore")—must be synced. If it’s not synced, your tuner won’t be able to see or use it.

You can, but your tuner won’t receive the file until it’s synced. To avoid delays, always sync your file in the TDN App before submitting a new request in Tuning Central.