Mazda3 (2014–2018) Firmware Compatibility
This covers the 3rd-generation Mazda3 (BM 2014-2016, BN 2017-2018), the Gen 6 MZD Connect years. The 2019+ Mazda3 (BP) runs Gen 7 and is a different system — see 2019+ Mazda3 infotainment.
How firmware updates actually work (staging, region codes, the update procedure) is the same across every Gen 6 car and is documented once on the platform pages linked below. This page only covers what’s specific to the Mazda3.
What shipped in your car
Section titled “What shipped in your car”Both BM and BN use the same CMU architecture, the same 7” center display, and the same Gen 1 Commander knob. Firmware binaries are interchangeable between them — a 2014 BM can run the exact same build as a 2018 BN. Region (NA / EU / ADR), not model year, is what differentiates the .up files.
| BM (2014-2016) | BN (2017-2018) | |
|---|---|---|
| Factory firmware range | v29.xx – v59.xx | ~v59.xx |
| Display | 7” center | 7” center (same panel) |
| Connectivity Module | Single USB, no hub | Single USB, no hub |
| Nav SD slot | Nav-equipped trims | Same |
The practical consequence: every 3rd-gen Mazda3 can be updated to v74.00.324A, the final Gen 6 build. There is no hardware barrier between a 2014 car and the latest firmware.
The CarPlay catch
Section titled “The CarPlay catch”CarPlay/Android Auto arrived with the v70 firmware branch in 2018. Updating an older Mazda3 to v70+ is necessary but not sufficient: the factory connectivity module is a single non-hub USB port, and CarPlay requires the USB hub assembly (part TK78-66-9U0C) that later cars shipped with. The full retrofit (firmware plus the hub harness) is covered on Mazda3 CarPlay.
Two-stage update from early builds
Section titled “Two-stage update from early builds”Cars still on launch-era firmware (v29.xx–v33.xx, original 2014 BM) can’t jump straight to v74. They need an intermediate step to v55+ first, then on to v74. Everything about how and why is on How firmware updates work; the update procedure has the USB steps.
Before you flash anything, pull the navigation SD card — leaving it in during an update risks corrupting it. See Navigation SD card.
Checking your current version
Section titled “Checking your current version”Settings > System > About lists the software version, or use the diagnostic screen. The cross-car walkthrough is on Check your firmware version, and the full version catalog with per-build notes is on Firmware versions.
Most common Mazda3 firmware complaints are resolved by getting to v74.00.324A: Bluetooth audio dropouts on v55–v59, early-v70 CarPlay disconnects, slow boot that worsens with age. Slow boot specifically is a platform-wide issue addressed on slow boot fix. v74 is also the baseline ScreenTune targets, if you go that route.
Related
Section titled “Related”- Mazda3 CarPlay — firmware + USB hub retrofit
- Firmware versions — full Gen 6 build catalog
- Firmware update procedure — USB flashing steps
- 2019+ Mazda3 infotainment — the Gen 7 successor