Cloud BMW tuning · F-series · G-series · Mini · Supra
Bootmod3 — BM3 — is one of the leading ECU tuning platforms for modern BMW, Mini and Toyota Supra. Flash custom software, datalog, map-switch and manage your calibration from a phone, tablet or laptop. At SamuelTuned, BM3 is used for custom remote tuning, so the car can be calibrated wherever it is in the world.
Bootmod3 is also called BM3 — same platform, shorter name.
What it is
Bootmod3 is a cloud-based ECU tuning and flashing platform built for modern BMW, Mini and Toyota Supra. Once your ECU is supported — and unlocked where required — the factory ECU is programmed through the car's OBD port. No removed ECUs, no laptop bench work to start a tune.
Through BM3 you flash tuning files, change maps, record datalogs, check fault codes and manage your calibration from a phone, tablet or laptop. The included map editor opens the platform up to fully custom calibration work — not just off-the-shelf files.
The platform
Bootmod3 is the connection, flashing and logging system — the bridge between your phone and the ECU.
The tune
The tune is the actual calibration file loaded into the car — what controls boost, fuelling, timing and torque.
Both matter. BM3 makes the workflow possible. The performance, safety and drivability of the car comes from the quality of the calibration loaded through it.
What it lets you do
Why use Bootmod3?
BM3 is one of the strongest options for BMW remote tuning because the customer and the tuner work in the same platform. Once your licence and hardware are in place, files flash from your phone, datalogs upload to the cloud, and revised calibrations come back through the same workflow.
Supported vehicles
Compatibility depends on exact model, engine, ECU type, production date and software version. Some cars need an ECU unlock first — see below.
The B58 is one of the most popular engines for BM3 tuning. It responds extremely well to correct calibration — especially with supporting hardware and the right fuel.
Common models
The S58 powers the latest BMW M cars. Once unlocked, BM3 handles flashing, datalogging and full custom map revisions on G-series M models.
Common models
Note · Most newer S58s require ECU unlocking before BM3 can flash. Once unlocked, the full BM3 workflow is available.
The S55 platform varies heavily car-to-car depending on hardware, fuel and intended use — which is exactly where custom BM3 calibration earns its keep.
Common models
A long-running BM3 platform. Stage 1, Stage 2 and hybrid turbo work all flash, log and revise through the same mobile workflow.
Common models
Stage 1, Stage 2 and custom software for modern BMW & Mini turbocharged 4-cylinder applications, all delivered through the BM3 mobile workflow.
Common models
BM3 also covers supported BMW V8 twin-turbo platforms. Big-power M and M Performance work where accurate calibration, logging and revision control matter most.
Common models
The 2020+ Supra runs the BMW B58, so BM3 covers it natively. Stage 1 through big-turbo custom remote tuning.
Common models
Hardware
Coming soon to this site — the right adapter, cable and licence for your car, in one place.
The easiest connection method for most customers. Wireless flashing, datalogging, diagnostics and map management — no laptop, no cables threaded through the cabin.
A wired ENET cable used with a laptop, ethernet adapter or mobile-device adapter. Reliable for setup and flashing — preferred by some customers — but most owners on the F/G platforms favour the wireless adapter for day-to-day use.
Required to use BM3 on your vehicle. The licence gives you access to the flashing system, your vehicle account, and the ability to manage maps, logs and tuning files.
Inside the platform
Flash the factory ECU through the OBD port — install, update or revise tuning software without removing the ECU.
Records what the ECU is actually doing under load — boost, throttle closure, ignition timing, knock, fuel pressure, lambda, torque limits and more. Every revision is built from real data, not guesswork.
Switch between calibration slots on supported cars: pump fuel, ethanol blend, race fuel, low-boost, high-boost, valet, track, drag — without re-flashing each time.
Compatible cars adjust calibration based on real-time ethanol content. No manual flashing every time the fuel mix changes.
E30, E40, E50 or E85 calibrations on supported B58, S58, S55, N55 and Supra platforms — matched to your fuel system, turbo and actual ethanol content.
Available on supported setups for faster boost response. Most relevant on larger turbos, drag and roll-race builds. Configured around your specific hardware and use case.
Adjustable overrun behaviour on many BMW platforms. Tuned sensibly — burble aggression that bakes catalysts is not on the table.
BM3 isn't limited to off-the-shelf files. The included map editor is what makes proper custom calibration and per-car revisions possible.
Read and clear fault codes during setup, hardware checks, tuning revisions and post-flash troubleshooting.
OTS vs custom
An off-the-shelf BM3 map can be enough on a near-standard car. But it is not built around your engine, your fuel, your turbo or your datalog results — and that limits how far it can take you.
Off-the-shelf
Designed to work across a wide range of cars. Limitations to be aware of:
Built for you
A custom BM3 tune is the right route once your car has supporting hardware, ethanol or specific performance goals. The calibration is built around your actual setup — and revised against real datalogs until the car behaves the way it should.
Especially useful for
Tune stages
Stage 1
The right starting point on a near-stock car: improved power and drivability without major hardware. Common on M140i, M240i, 340i, 440i, M135i, M235i, 230i, 330i, G80 M3, G82 M4 and Supra 3.0.
Stage 2
Once the supporting hardware is in (downpipe, intake, intercooler, fuel pump, plugs, cooling), Stage 2 lets the calibration take advantage of it. Strong on B58, S58, S55, N55 and Supra.
Stage 3 / Custom
Generic files rarely suit larger turbos — airflow, boost control and torque behaviour are completely different. Custom BM3 calibration is built around your actual turbo, fuel system and datalogs.
Remote tuning
Step 01
You'll need the correct Bootmod3 hardware to connect to the car — typically the BM3 WiFi adapter. Available directly from this site.
Step 02
Install Bootmod3, register your vehicle and activate the licence covering your engine family.
Step 03
Newer BMW G-series and modern Bosch MG1/MD1 ECUs need to be unlocked first. If yours is locked, that step happens before any flashing.
Step 04
Samuel issues your first calibration file. You flash it through Bootmod3 from your phone.
Step 05
You drive the car under the requested conditions and record the datalogs Samuel asks for.
Step 06
Samuel reviews the logs, refines the calibration and sends a revised file. You re-flash and run another log set.
Step 07
Once the data shows the car behaving exactly as it should, the calibration is finalised and you keep driving.
ECU unlock
Some vehicles require ECU unlocking before BM3 can flash the ECU — especially modern BMW G-series cars and Bosch MG1/MD1 ECUs. If yours is locked, BM3 can't write tuning software until the unlock is completed (in-house or via FEMTO/Autotuner depending on the ECU).
ECU unlock guideUnlock typically required for
Before we start
Getting these right makes the tune faster, cleaner and safer.
FAQ
Anything else, message Samuel directly — every Bootmod3 build is different.
Yes. BM3 is just the shortened name for Bootmod3 — same platform.
Yes — BM3 is one of the strongest platforms for remote BMW tuning. Files flash, datalogs upload and revisions return through the same workflow, no workshop visit required.
You can flash with different connection methods, but the BM3 WiFi adapter is the easiest option for most customers. It makes flashing, logging and remote-tuning revisions much simpler.
Yes — Bootmod3 hardware will be available to purchase directly from this site.
Yes — Bootmod3 works through mobile devices, tablets and laptops depending on your setup and connection method.
No. If your ECU requires unlocking, that has to happen before BM3 can flash any tuning software.
For a near-stock car, an OTS map can be enough. For modified cars, ethanol, upgraded turbos, track or drag use, a custom BM3 tune is the right route — calibrated around your actual setup.
Ready to start
Whether you already have BM3 or you are starting from scratch, the process is handled remotely from anywhere in the world.