Remap your BMW yourself, on your own drive
No booking, no waiting, no one else touching your car. Plug in a cable, read your car for free, pick a tune and flash it, engine and gearbox, from one app.
What you need
- An ENET cable
- OBD to Ethernet, about £15 online.
- A Windows laptop
- iPhone and Android apps are on the way.
- A battery charger
- On the car while you flash.
How it works
- Plug in
- An ENET cable (about £15) from the OBD port to a Windows laptop, with a charger on the battery.
- Read your car
- Hellflash finds the engine and gearbox computers and saves a full backup. Free.
- Pick a tune
- A stage, a few plain choices, the full editor, or describe it to Hellflash AI.
- Flash and drive
- Checksums corrected, every write verified, back to stock any time.
Why it is safe to try
- Read your car free
- See exactly what is on it before you pay.
- Full backup first
- Your stock software is saved before the first write.
- Checksums handled
- Corrected on every build, every write verified.
- Back to stock
- Any time, from the same app.
What you can change
Stage 1, 2 and 3 maps, pops on upshift, a quiet cold start, the exhaust flap, the speed limiter, 34 gearbox settings, and a 906-table map editor if you want to go deep. Or just tell Hellflash AI what you want, free with your licence as it rolls out.
What it costs
£300 once, per car. It covers the engine and the gearbox, with updates for that car, and Hellflash AI free as it rolls out. No subscription and no credits.
Questions
Anything else, email support@hellflash.com
Is it safe to remap my own BMW?
Hellflash saves a full backup before the first write, corrects checksums on every build, verifies every write and asks for a battery charger on the car. You can always flash back to stock.
Is remapping legal in the UK?
Remapping is legal, but you must tell your insurer, the car still has to pass its MOT, and some features, like a raised speed limiter, are for track use only.
Which BMWs can I remap?
Engine and gearbox flashing works today on the B58 (MG1CS003): M140i, M240i, 340i, 440i and the early G-series 40i cars. B58 Gen 2, S58, N55 and N54 are supported for tuning.
Can I go back to stock?
Yes. Hellflash reads and saves your car's own software before the first flash, so you can put it back any time.
What do I need?
A standard ENET cable (OBD to Ethernet), a Windows laptop and a battery charger on the car while you flash. iPhone and Android apps are on the way.
How much does it cost?
£300, one time, per car. It covers the engine and the gearbox, with updates for that car. No subscription and no credits.
Start with a free read of your car.
Read your car for free first. If it fits, it’s £300 once and it’s yours.