How to Revert and Uninstall ScreenTune

Every change ScreenTune makes is reversible. There are two different paths back, and they are not the same thing. The normal path is a revert — ScreenTune restores the exact files it backed up before it modified them. The deep path is a full firmware reflash — an owner-obtained Mazda firmware image overwrites the whole root filesystem. The list below is ordered from least to most invasive. Start with the first; only move down if the one above doesn’t clear the problem.

1. Uninstall from the Miatafy app

This is the normal way to remove ScreenTune and the right first step in almost every case.

Open the Miatafy app and select Uninstall. In one pass it:

1. Restores every modified file from the backup taken during install
2. Removes custom apps
3. Reboots the CMU to a clean state

The uninstall does not touch the firmware version. It reverses ScreenTune’s changes on the configuration that was validated at install time and leaves the firmware exactly where it was.

This restores the state ScreenTune first captured — not guaranteed factory-stock. If the unit was already modified before ScreenTune’s first install (legacy AIO, manual edits), that prior-modified state is the baseline you get back. Only a full firmware reflash guarantees factory. A revert also requires the unit to still boot.

2. Support-assisted recovery

Use this if the app uninstall runs but doesn’t fully resolve the problem — for example an install that was interrupted, only partially applied, or left the system in an unusual state.

Email support with your firmware version and a short description of what happened (what you were doing when it broke, any error on screen, whether the uninstall completed). Don’t run a firmware reinstall first if you’re unsure — it overwrites the evidence that helps diagnose the original fault.

3. Full firmware reflash

A full reflash overwrites the root filesystem entirely. It is the most complete reset: it removes everything that isn’t stock, including modifications ScreenTune didn’t make (legacy AIO tweaks, manual edits, leftover files from an interrupted install). This is the same mechanism a dealer uses.

Miatafy does not ship the firmware. The .up firmware image for a full reflash is obtained by you — through dealer/service channels, Mazda’s own update channels, your own prior backup, or otherwise lawfully obtained. We provide the procedure and the support; the firmware binary is not ours to distribute.

1. Obtain the correct-region firmware .up file for your unit
2. Prepare a USB drive with it
3. Insert it into the CMU USB port
4. Follow the on-screen update prompts
5. Wait 20–40 minutes for it to finish — do not cut power or turn the ignition off
6. The unit reboots to factory state

This is the clean-slate option, and it needs the unit’s USB auto-update path still intact to run. A boot- or failsafe-level hardware brick can require SPI-flash-level service that no USB drive fixes; for that case see option 4. See backup and recovery for preparing the drive and sourcing the right firmware file, and firmware recovery for the full procedure.

4. Mail-in / in-person recovery service

For a hardware-level brick (a unit that won’t reach the USB update path at all), recovery is available as a paid mail-in or in-person service. This is a repair act at the SPI-flash level, not something a USB drive can do. Email support to arrange it.

If the CMU has legacy AIO tweaks

If the unit was previously modified with MZD-AIO tweaks (from mazdatweaks.com), the Miatafy app uninstall will not revert those. AIO touched the same files but used different backup conventions, so ScreenTune’s uninstall has no record to restore them from.

To clear legacy AIO modifications:

• Run the AIO uninstaller if you still have it, or
• Do a firmware reinstall with a recovery USB (option 3 above)

If you don’t know whether AIO tweaks are present, the firmware reinstall is the safest route to a known-good baseline. More on telling the two apart: ScreenTune vs MZD-AIO.

Confirming the revert worked

After any revert path, the unit should behave exactly like stock. Check:

Check	Expected after revert
Disclaimer screen appears on boot	Yes
Touchscreen locks while driving	Yes
Boot time back to factory (~48 seconds to interactive)	Yes
No custom apps in the Applications menu	Yes

If any of these still show modified behavior, the revert didn’t fully complete — move to the next option down the list, or contact support.

Before a dealer visit

Reverting before service avoids the dealer’s update tools tripping over unexpected file states. For a unit with a known, ScreenTune-only history, the app uninstall is enough. If the modification history is unknown or includes legacy tweaks, a firmware recovery USB is the most thorough prep.

Full checklist: dealer visit guide.