v74.00.324A: The Final Gen 6 Mazda Connect Firmware
v74.00.324A is the last widely distributed Gen 6 Mazda Connect firmware, and on most North American cars that were ever updated it is the version the CMU (the Connectivity Master Unit, the computer behind the dash) now reports. The string parses cleanly: 74 is the major build, 00.324 the minor revision and build, and the trailing A is the North American market spec suffix. The same Gen 6 CMU runs it across the lineup (MX-5, CX-5, Mazda3, Mazda6, CX-3, CX-9), so the version means the same thing regardless of the badge on the trunk. A 2018 CX-5 and a 2017 MX-5 can run identical firmware.
The verdict. If your About screen reads 74.00.324A, you are on the final standard Gen 6 release and need no further update; reinstall only for recovery or a dealer-documented issue. See Should you update? for the by-version decision table.
This page is the version reference for that platform. To read your own version, see Check firmware. For the owner-facing “what changes if I update?” view, see How firmware updates work. For a teardown comparison of the actual files that change between v70, v74.00.230A, and the final v74.00.324A, see What changes inside the CMU. For the region/letter suffixes in filenames, see Firmware region codes.
v74.00.324A is the final standard Gen 6 release
Section titled “v74.00.324A is the final standard Gen 6 release”| Question | Answer |
|---|---|
| What is v74.00.324A? | The last widely distributed Gen 6 Mazda Connect CMU firmware. North American market spec (the A suffix). |
| Is it the latest? | It is the latest standard public update. A higher build, 74.00.331, is community-reported on some newer and replacement CMUs but has no official public package or changelog. |
| Which cars run it? | Any Gen 6 Mazda Connect car that was updated: MX-5, CX-5, Mazda3, Mazda6, CX-3, CX-9. See the year table below. |
| Can I roll it back? | Mazda treats it as one-way. Community recovery paths exist but are not general advice. |
To put any supported car on this build, see how to get to v74.00.324A. To confirm what you are running before you assume, check your firmware.
Which Mazdas and model years run v74.00.324A
Section titled “Which Mazdas and model years run v74.00.324A”A Gen 6 car reaches v74.00.324A only if it was updated to it. Factory firmware was older, so the model year tells you the platform, not the installed version. The same Gen 6 CMU spans these cars and years:
| Model | Gen 6 model years | How it typically reaches v74.00.324A |
|---|---|---|
| Mazda3 | 2014–2018 | Dealer infotainment work or a DIY update; pre-2019 cars never updated are often still on v55–v59. |
| CX-5 | 2016–2020 | Same. Updated cars land on v70+, then v74.00.324A. |
| Mazda6 | 2016–2021 | Same. Confirm on the About screen, not from the year. |
| CX-3 | 2016–2021 | Same. Confirm on the About screen, not from the year. |
| CX-9 | 2016–2020 | Same. Confirm on the About screen, not from the year. |
| MX-5 (ND) | 2016–2023 (ND1/ND2) | ND2 shipped on v59.x and was often moved to v70+ by dealers during CarPlay retrofit or service. |
Year spans come from the supported vehicles table, drawn from Mazda North America service material posted through NHTSA (MC-11006998). The 2014–2015 Mazda6, CX-3, CX-9, and MX-5 model years predate the Gen 6 CMU or the model itself; the Gen 6 unit started in those cars in 2016.
Do not read v74.00.324A off the model year. A 2019+ car or any car that saw dealer infotainment work is frequently on v70 or higher, but only the version screen is authoritative. Check your firmware to confirm rather than assume.
What a version number controls
Section titled “What a version number controls”Firmware on a Gen 6 CMU is not cosmetic. The major build determines the filesystem layout and the service set that boots, which is why tweaks written for one era stop working on the next:
- CarPlay / Android Auto retrofit became possible at the v70-era software. A unit on older firmware physically cannot run the retrofit until it is brought to v70+ and paired with the compatible USB hub kit.
- Legacy MZD-AIO tweaks target the v55–v59 filesystem. They do not run on v74 because the internal file structure changed too much; v74 needs v74-specific implementations.
- Rollback is treated by Mazda service material as one-way. Official docs warn that the latest software cannot be downgraded; community recovery paths exist but are not general advice. The About screen lists a separate Failsafe Version (see Check firmware) that is not a rollback target you can select. It reflects whatever package last carried a fail-safe image, which Mazda eliminated at
70.00.335; single-file updates since then leave it untouched, so it commonly sits at an old59.xvalue next to a current74.xOS. See update procedure for the staged-update history behind that number.
Firmware timeline
Section titled “Firmware timeline”| Version / family | Evidence | Key notes |
|---|---|---|
| v27–v33 | Community changelog aggregation | Early Gen 6 releases. Historical context only. |
| v55.00.753 / v55.00.760 | Mazda customer letter, NHTSA-posted service docs | Common early tweak baseline; official docs show the .up package flow and v55-era fixes. |
| v56.00.513 | Community reports | Reported in EU/ADR forms. Public vendor documentation is thin. |
| v58.00.250 / v58.00.251 | NHTSA service alert plus community reports | Often described as the last easy AIO era before later restrictions. |
| v59.00.502+ | NHTSA TSB and Mazdatweaks docs | Official v59 milestone. v59.00.502+ requires additional preparation for AIO. |
| v70.00.100+ | Mazda retrofit announcement, NHTSA service docs | CarPlay / Android Auto retrofit era. Retrofit needs both v70+ software and the compatible USB hub/cable kit. |
| v74.00.324A | NHTSA TSBs | Late documented Gen 6 service baseline and this site’s primary research target. |
| v74.00.331 | Community reports only | Appears on some newer/replacement Gen 6 CMUs, especially 4A N / Taiwan or wireless-CarPlay contexts. No official public standalone package or changelog found. |
The sections below are for tweak and research depth: package identifiers, the AIO/CarPlay/rollback matrix, and the evidence behind the v74.00.331 question. Owners who only needed their version answered can stop at the verdict above.
Why this site documents against v74.00.324A
Section titled “Why this site documents against v74.00.324A”For research and tweak development this site uses v74.00.324A as its main reference, because it is widely discussed in the community and well-documented in public records. Treat it as a documented baseline, not a recommendation that every car should be on it.
- It is late enough to include the CarPlay / Android Auto era. Mazda began shipping CarPlay-equipped vehicles in late 2018 and offered dealer retrofits for applicable 2014+ Mazda Connect cars.
- Community tools and notes commonly use 74.00.324A as their baseline.
- Legacy MZD-AIO tweaks do not work here. They are written for older firmware and the v74 file structure broke them.
- Later builds may exist for some regions or service paths. Verify your exact current OS version, failsafe version, region, and hardware before updating.
Known package metadata and checksums
Section titled “Known package metadata and checksums”Firmware packages are identified by display version, region, and filename. This site documents package identifiers, filenames, and checksums where a trusted hash exists; it does not host, mirror, or link to the binaries.
North America (NA N). These values are verified against the North American 74.00.324A package and match the community-maintained NA N CMU hash list:
| Field | Value |
|---|---|
| Filename | cmu150_NA_74.00.324A_update.up |
| Size | 1,003,179,676 bytes (1003 MB) |
| MD5 | 49c7c7a834ca40cbbbb68f29ee696475 |
| SHA-1 | 975935bd09e9ea90cfec22ae87d66b310a2242e3 |
Europe (EU N). These values are verified against the European 74.00.324A package and match the community-published EU N CMU hash value:
| Field | Value |
|---|---|
| Filename | cmu150_EU_74.00.324A_update.up |
| Size | 2,432,208,800 bytes (2.4 GB) |
| MD5 | 9b841bc807a5010a8652bb3b9e894f91 |
| SHA-1 | 3aa55dadc8d59fadb0c69af17444447b097baf18 |
The EU package is about 2.4 GB against 1003 MB for NA, so a size check alone tells the two apart. A community “EU N CMU HASH Value” list (Scribd) documents the EU hashes.
Asia-Pacific (4A N / ADR). The ADR variant follows the same naming pattern, cmu150_ADR_74.00.324A_update.up. Its hash is not verified for this page. Verify any ADR package against the hash printed in the vendor’s own accompanying .txt before installing, and confirm the region code first. See Firmware region codes for the conventions and the wrong-region risks.
Compatibility matrix
Section titled “Compatibility matrix”| Version / family | AIO / tweak status | CarPlay / Android Auto | Update / rollback notes |
|---|---|---|---|
| v55–v58 | Strongest legacy AIO era; exact behavior varies by build | No native retrofit until v70-era software | Older units may need staged updates; verify the route before flashing |
| v59.00.502+ | Mazdatweaks reports serial/prepared access is required for AIO | No native retrofit until v70-era software | Public docs confirm v59.00.502 as an official update milestone |
| v70.x | Older-firmware AIO may still apply where MZD-AIO documents support | Official retrofit generation; install docs require v70.00.021+ before fitting the new hub | Mazda service docs warn the latest software cannot be rolled back |
| v74.00.324A | Legacy AIO does not work; use v74-specific implementations | Supports retrofit-equipped systems | Late official service baseline; use region-correct packages only |
| v74.00.331 | Legacy AIO does not work; tweak support not validated | Reported on wireless-CarPlay-capable CMUs | No official public package or changelog found; downgrade/reinstall path unclear |
Mazda treats Gen 6 updates as service-controlled and not rollback-supported. Community downgrade and recovery reports exist but are not general advice. See Update procedure and Backup and recovery for practical guidance.
v74.00.331 status
Section titled “v74.00.331 status”Public evidence supports that 74.00.331 exists, but with caveats:
- Mazda3Revolution and Reddit reports describe
74.00.331 4A Non newer or replacement Gen 6 CMUs, especially Taiwan / newer CX-5 and wireless-CarPlay contexts. - One Miata.net owner report describes a dealer-replaced infotainment unit showing
74.00.331. - A Mazdas247 thread documents the community discovering
74.00.331after74.00.324Ahad been treated as the latest normal standalone update. - No official Mazda release page, NHTSA changelog, or generally available standalone
.uppackage was found for it.
Supportable wording: 74.00.331 is community-reported and appears on some Gen 6 CMUs, but it should not be treated as a normal public update target for NA/EU/ADR owners unless a region-correct package and recovery path are verified.
Obtaining firmware
Section titled “Obtaining firmware”Gen 6 CMU firmware is normally distributed through dealer and service channels. Community mirrors and forum links exist, long-running Mazda3Revolution threads among them, but they are not official Mazda distribution points.
Do not install firmware from unknown sources. Use region-correct packages, compare checksums or file sizes when a trusted source provides them, and keep the car powered for the entire update. A corrupt, modified, or wrong-region .up file can leave the CMU unable to boot normally. If you are trying to reach a known-good baseline, see how to get to v74.00.324A for the dealer request script and verification checklist.
File format
Section titled “File format”Gen 6 firmware ships as .up packages containing filesystem images, configuration manifests, and signing certificates. These are service-distribution files and are not meant to be opened or modified by owners.
Validation links
Section titled “Validation links”| Resource | Link |
|---|---|
| Mazda Connect support | connect.mazda.com |
| Official Gracenote update page | connect.mazda.com Gracenote |
| Mazda USA CarPlay / Android Auto retrofit announcement | Mazda USA News |
| Mazda / NHTSA Gen 6 v74.00.324A service alert | MC-11006998 |
| Mazda / NHTSA newer Mazda Connect service alert | MC-10251373 |
| Mazda / NHTSA 2022 software TSB | MC-10226834-0001 |
| Mazda / NHTSA 2018 CarPlay retrofit bulletin | MC-10144323-9999 |
| Mazda firmware changelog aggregation | drone540/mazda-firmware-changelogs |
| Community EU N CMU hash list | EU N CMU HASH Value (Scribd) |
| MZD-AIO support notes | mazdatweaks.com |
| Community firmware 74+ discussion | Mazda3Revolution MZD-AIO on FW 74 thread |
| v74.00.331 discussion | Mazdas247 thread |
| ZDI Mazda IVI writeup | ZDI blog |
| Copyright owner distribution rights | 17 U.S.C. § 106 |
| Computer-program copy exceptions | 17 U.S.C. § 117 |
| DMCA exemption regulation | 37 CFR § 201.40 |