Audi MMI Update Not Detected – SD Card & “Medium Unavailable” Troubleshooting

You have downloaded the correct Audi MMI firmware or navigation maps, copied the files to an SD card and inserted it into the car.

But the MMI does not see the update.

You may get:

“The medium is currently unavailable”

or the update menu may simply show no usable update package.

In many cases, the update files themselves are not the problem.

The cause is often one of these:

• incorrect SD card file structure
• update files inside an unnecessary parent folder
• incompatible filesystem
• unsuitable or unreliable SD card
• microSD-to-SD adapter problem
• incomplete archive extraction
• corrupted download
• using the wrong update menu
• update package incompatible with the MMI system

Before downloading the complete package again or attempting another firmware version, check the update media first.

Quick Diagnosis

Symptom	Check first
MMI does not show any update	SD card structure and update menu
“The medium is currently unavailable”	Card, filesystem, reader/adapter
SD card works on PC but not in MMI	Format, card compatibility, adapter
Update package visible but cannot be selected	MMI/package compatibility
MMI sees card but not firmware	Parent folder / root structure
Files disappear or extraction fails	Download/archive integrity
Another SD card works	Original card or adapter
Correct files still not detected	Exact MMI version and update procedure

The most important rule is:

Do not change firmware simply because the MMI cannot see your SD card.

First prove that the update media is prepared correctly.

Step 1 – Check Which Audi MMI System You Have

Different Audi infotainment generations use different update packages and procedures.

Common software prefixes include:

BNav_
HNav_
HN+_
HN+R_

MHIG_

MHI2_
MHI2Q_
MHS2_
MH2p_

MHI3_

An SD card prepared correctly for one platform does not guarantee that the package itself is compatible with another.

Before troubleshooting further, record the complete software version.

If you are unsure:

Which Audi MMI Do I Have? Complete Identification Guide

Step 2 – Extract the Download Completely

Do not simply copy the downloaded .rar, .zip or multipart archive to the SD card unless the supplied instructions specifically tell you to do that.

The update normally needs to be extracted first.

For example, you may download:

HN+R_EU_AU_P1001.rar

After extraction you may get a folder:

HN+R_EU_AU_P1001

Inside that folder are the actual update files.

Those contents are normally what need to be copied to the SD card.

If you have problems extracting the archive, use:

How to Unpack Audi MMI Update Files

Step 3 – Do Not Leave the Update Inside an Extra Parent Folder

This is one of the most common mistakes.

Wrong

SD CARD
└── HN+R_EU_AU_P1001
    ├── update files
    ├── folders
    └── metadata

The MMI may not find the update because the required files are one directory too deep.

Correct

Open:

HN+R_EU_AU_P1001

and copy its contents directly to the root of the SD card.

For example:

SD CARD
├── metainfo2.txt
├── default
├── config
├── data
└── other update files/folders

The exact filenames vary between firmware and MMI generations.

The important point is the directory level.

Do not add another folder around the supplied update structure.

This is the main issue covered by the original version of this tutorial.

What Does “SD Card Root” Mean?

The root is the first level you see when you open the card.

For example, if Windows shows:

E:\

the update files should begin directly inside:

E:\

rather than:

E:\Audi Update\Firmware\HN+R_EU_AU_P1001\

unless your specific installation instructions explicitly require another structure.

Step 4 – Check the SD Card Filesystem

Use the filesystem required by the update procedure.

For many older Audi MMI update procedures — particularly MMI 3G — FAT32 is commonly used.

Do not assume that:

exFAT
NTFS
FAT32

are interchangeable.

If your instructions specify FAT32, format the card as FAT32 before copying the files.

Important

Formatting deletes the existing contents of the SD card.

Back up anything you need first.

What Size SD Card Should I Use?

The safest answer is:

use the card size specified for the update package and MMI generation.

For many MMI 3G firmware procedures, a standard SD/SDHC card with enough space for the package is preferable.

The old The medium is currently unavailable article specifically focused on problems seen when unsuitable larger cards were used with older MMI update procedures. We are keeping that troubleshooting point here, but not treating 32 GB as a universal limit for every Audi MMI generation.

Newer MIB systems have different media requirements.

So:

MMI 3G instructions
→ follow MMI 3G media requirements

MIB1 / MIB2 / MIB3
→ follow the package-specific requirements

Do not apply an old MMI 3G SD-card rule to every Audi infotainment system.

Step 5 – Avoid Questionable microSD Adapters

A microSD card inserted into a full-size SD adapter may work perfectly.

But when troubleshooting a card-detection problem, the adapter introduces another possible failure point.

If the MMI reports:

“The medium is currently unavailable”

try:

• another adapter
• another SD card
• preferably a normal full-size SD card where practical

especially if the same microSD card works intermittently.

A worn adapter contact can create very confusing symptoms.

Step 6 – Check the SD Card on Your Computer

After copying the files, remove the SD card safely and insert it again.

Make sure:

• the card opens normally
• all folders are visible
• files have sensible sizes
• nothing became corrupted
• the expected root structure remains intact

If Windows or macOS reports that the card needs repairing, do not use it for an MMI firmware update.

Prepare reliable media instead.

Step 7 – Make Sure the Archive Extracted Without Errors

A corrupted download can look normal until the MMI attempts to read one of the damaged files.

If your extraction software shows:

• CRC error
• unexpected end of archive
• missing volume
• damaged archive
• checksum error

stop.

Do not copy the partially extracted files to the vehicle.

Download or extract the package correctly first.

Multipart Archives

Some larger map packages may consist of multiple archive parts.

For example:

update.part1.rar
update.part2.rar
update.part3.rar

Normally all parts need to be present in the same directory before extraction begins.

Do not separately extract each part and combine random folders afterward.

Follow the instructions supplied with that download.

Step 8 – Use the Correct SD Slot

On systems with multiple SD slots, follow the installation instructions for the selected update.

If the procedure tells you to use:

SD1

do not arbitrarily move the card to another slot because the update did not immediately appear.

Likewise, remove unnecessary media during troubleshooting.

Keep only the update card inserted where practical.

Step 9 – Open the Correct Update Menu

Another common mistake is entering the wrong menu.

Audi MMI can have several different service or engineering menus.

For many MMI 3G firmware procedures, the required update screen is the Red Engineering Menu, not the Hidden Green Menu.

Do not confuse:

Red Engineering Menu
→ software/update functions

with:

Green Engineering Menu
→ advanced configuration/diagnostic functions

The original version of this tutorial already identified entering the wrong menu as another reason users believe the update is missing.

Green Menu Is Not the Firmware Update Menu

This deserves its own warning.

If you activated the Hidden Green Menu and cannot find your firmware package there, that does not mean the SD card has failed.

You may simply be looking in the wrong place.

Do not start changing Green Menu options trying to force the update to appear.

Step 10 – Wait for the MMI to Read the Card

Do not assume the card has failed after one or two seconds.

Large media or slower SD cards may take some time to initialize.

Insert the card, allow the MMI to read it and then enter the correct update procedure.

However, if the card repeatedly remains unavailable, continue troubleshooting rather than repeatedly restarting the update process.

MMI Sees the SD Card but Says No Valid Update Is Available

This is different from the MMI not seeing the card at all.

If the SD medium is recognized but no compatible update is offered, check:

• complete MMI software version
• firmware family
• region
• current firmware
• target firmware
• update path

For example:

HN+_EU_AU3G_...

should not be treated as the same update target as:

HN+R_EU_AU_...

or:

HNav_EU_...

even though all can broadly be described as MMI 3G systems.

The fact that files fit on the SD card does not make them compatible.

MMI Detects the Card but the Update Is Greyed Out

If the update package is visible but cannot be selected, the problem is probably no longer basic SD-card detection.

Possible directions include:

• incompatible firmware
• unsupported update path
• already installed software
• wrong software train
• package-specific update restrictions

Do not try to solve this by reformatting the card ten times.

Check compatibility.

“The Medium Is Currently Unavailable”

If this exact message appears, use this sequence:

1. Remove the card
2. Check it on a computer
3. Verify the filesystem
4. Verify the update file structure
5. Try another reliable card if available
6. Eliminate the microSD adapter
7. Insert the card again
8. Enter the correct update menu

If another SD card with the same correctly prepared files works, the first card or adapter was likely the problem.

If neither works, investigate the package structure and MMI compatibility.

SD Card Works for Music but Not for the Update

That does not prove the update has been prepared correctly.

The MMI can potentially read normal media files while still rejecting an update package because:

• required metadata is in the wrong folder
• package is incompatible
• update menu is wrong
• required files are missing

Separate:

MMI can read SD card

from:

MMI can recognize this as a valid software update

They are different tests.

Update Worked Before but New Package Is Not Detected

Compare the preparation of the old and new cards.

Check:

• file structure
• archive extraction
• filesystem
• card used
• firmware family
• region

Do not assume the new package is defective merely because the previous one appeared immediately.

macOS Users – Check the Extracted Folder Carefully

On macOS, archive extraction and copying can sometimes leave additional metadata files on removable media.

These files usually do not matter, but the important thing is still that the actual Audi update structure remains intact.

Do not:

• rename update files
• reorganize folders
• put the whole package into your own folder

Use the package structure supplied with the update.

Do Not Rename Firmware Files

If the MMI does not detect the update, renaming files is not the solution.

Do not change:

metainfo
firmware folders
configuration files
package directories

unless the exact update instructions explicitly tell you to.

The system expects specific names and paths.

Should You Reformat the Card?

Yes, as a troubleshooting step if:

• the card has been used for many unrelated files
• filesystem is wrong
• MMI intermittently recognizes it
• previous attempts left a messy directory structure

But first make sure you can restore the update files afterward.

A freshly formatted card also makes it easier to verify that only the required update files are present.

Should You Buy Another SD Card?

Not immediately.

First check:

• parent folder
• format
• package extraction
• update menu

If all of those are correct and the card is still unavailable, testing another known-good card is a sensible next step.

Do Not Start a Firmware Update With Unreliable Media

If the MMI is repeatedly losing access to the SD card before the update starts, do not ignore that and proceed with firmware flashing.

Firmware installation requires reliable access to the update files.

A card that disconnects, produces read errors or behaves inconsistently should be replaced before the update.

Troubleshooting Decision Table

What you see	Next step
Card not detected at all	Format/card/adapter diagnosis
“Medium unavailable”	Card + filesystem + adapter
Card visible, update invisible	Root structure / parent folder
Update visible but incompatible	Firmware/MMI compatibility
Archive has CRC error	Re-download/extract
MMI enters Green Menu	Use correct update menu
Files are inside one extra folder	Move package contents to SD root
Card works intermittently	Try known-good media
Several correct cards fail	Verify package and MMI version

Correct Preparation Checklist

Before going back to the car:

[ ] Correct MMI package
[ ] Correct region
[ ] Archive completely extracted
[ ] No extraction errors
[ ] Correct filesystem
[ ] Reliable SD card
[ ] No unnecessary parent folder
[ ] Update contents in correct SD root structure
[ ] Files not renamed
[ ] Correct update menu identified

Only after those checks should you start investigating a deeper MMI problem.

Frequently Asked Questions

Final Checklist

If your Audi MMI update is not detected, work through the problem in this order:

Identify MMI
↓
Confirm correct update package
↓
Extract archive completely
↓
Verify SD card format
↓
Copy update CONTENTS to the correct root level
↓
Eliminate microSD adapter/card problems
↓
Insert card into correct slot
↓
Open correct update menu
↓
Check package compatibility if still not detected

Do not start experimenting with unrelated firmware versions just because the update does not appear.

In most cases, the first things to inspect are the SD card, file structure and update procedure.

For the complete firmware installation process:

How to Update Audi MMI Firmware

If you do not know which update package fits your Audi:

Check the Correct Upgrade for Your Audi