bootmod3 BM3 BMW B58 OBD Flash Tune & Remap Licence M140i, M240i, 340i, 440i, Z4 (F & G Series) | ECU/DME Tuning, Stage 1 & 2 OTS Maps

BM3 licence for BMW B58 - instant ECU reflash via the OBD port for M140i, M240i, 340i, 440i and Z4

Unleash serious real-world performance from your B58-powered BMW with the bootmod3 BM3 software licence. This pioneering cloud platform delivers rapid ECU programming through the diagnostic port with no control unit removal. Perfect for F and G chassis M140i, M240i, 340i, 440i and Z4 owners who want sharper throttle response, stronger mid-range torque and smooth, factory-like drivability with the flexibility to switch calibrations as your build evolves.

Flash your calibration using the BM3 app on iOS, Android or any web browser. Store maps and logs in the cloud and revert to stock any time. It is the smart, safe and proven way to transform the B58 straight-six.

Why enthusiasts choose BM3 on the B58

• OBD-based ECU programming - fast, convenient and reliable
• One off licence with one Off The Shelf map included
• Switch maps for daily use, track days or drag events in minutes
• True OEM-like refinement with huge gains in torque and power
• Used by us and our customers with outstanding feedback on performance and features

Measured power gains on supported fuels

• Stage 1 91 octane - up to 18 percent horsepower and 26 percent torque
• Stage 1 93 octane - up to 20 percent horsepower and 26 percent torque
• Stage 2 91 octane - up to 24 percent horsepower and 32 percent torque
• Stage 2 93 octane - up to 26 percent horsepower and 32 percent torque
• Stage 2 AGG calibrations available for more assertive exhaust overrun

From stock hardware to upgraded turbo builds, BM3 covers everything from a mild road setup to a focused track calibration.

Feature set - B58 ECU recalibration suite

• Mobile and web flashing with cloud backup for tunes and logs
• High speed datalogging of hundreds of parameters - up to 40 channels at once
• Share, review and analyse logs directly in app or browser
• Restore factory software and lock the DME back to OEM when required
• Live dashboard with real-time gauges and safety monitoring
• Diagnostics - read and clear fault codes across vehicle modules
• Reset learned adaptations including octane, knock and Valvetronic

Advanced calibration options

• Top speed limiter removal
• Exhaust overrun control on OTS and custom calibrations
• Exhaust valve behaviour adjustments
• Cold start catalyst heating disable for quieter starts
• Cat efficiency check suppression for off-road use when running decat pipes
• Support for upgraded turbos, ethanol blends and race fuel, methanol control
• Custom throttle mapping for enhanced pedal feel
• Backend flash compatibility for piggyback users
• Optional OTS Map Bundle for full access to all OTS calibrations
• Optional full custom tuning via the bootmod3 Tuner Directory or self-tune with the integrated editor

Vehicle coverage

Designed for B58-powered BMW models, including M140i, M240i, 340i, 440i and Z4 across F series and G series platforms. Ideal for drivers searching in the UK for B58 software, M140i tune UK, 340i ECU upgrade, 440i Stage 1, G20 340i mapping, F30 340i tuning, Z4 B58 software licence and BM3 B58 calibration.

What you need to get started

• OBD ENET cable - required and available separately
• bootmod3 OBD WiFi Agent - optional for cable-free flashing
• No DME removal required

Professional fitting and support

Want a hassle-free install with guidance on the right OTS map, logging and setup for your M140i, M240i, 340i, 440i or Z4 B58? MJ Modifications offers fitting and support in Warwickshire. Request a quote at info@mjmodifications.co.uk.

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Warranty and emissions notice

Some modifications and calibrations may affect manufacturer warranty coverage. Certain features may not be legal for road use in some regions. It is the customer’s responsibility to check local laws and regulations and to understand any potential impact on the vehicle’s factory warranty.