Different Fuel
Move between valid calibrations prepared for the fuel that is actually in the vehicle.
MG Flasher Custom Code FeatureSwitchable Maps
Switchable Maps
On-The-Fly
Change between supported tuning map slots in real time without performing a full ECU reflash. Use the MG Flasher app or supported steering-wheel controls to select the calibration that matches your fuel, hardware and driving setup.
New to MG Flasher? How It Works
5
Map Slots
0–4
Slot Range
Live
No Full Reflash
Live Control
Switchable Maps
Connected
0
1
2
3
4
ACTIVE
0
SLOT
DEFAULT CALIBRATION
Slot 0
The map selected before flashing becomes the default calibration. Slot 0 is always treated as valid.
Visual example only. The actual fuel, power level and calibration assigned to every slot depend on the flashed OTS map or custom tune.
One Flash. Multiple Calibrations.Change the Map.
Change the Map.
Not the Workflow.
Switchable Maps gives compatible vehicles access to multiple calibrated map locations after one supported flash. Instead of starting another complete flashing process, the driver can select an available slot in real time.
A slot may contain a different octane calibration, an ethanol blend, a reduced-power setup or another tuner-defined calibration. The exact contents are determined by the OTS package or custom tune installed on the vehicle.
Different Output
Select an available power-level or driving calibration without loading a new file each time.
Two Control Methods
Use Live Control in the MG Flasher app or the Custom Code Menu through supported vehicle controls.
Slot Validation
Disabled or invalid slots are blocked or clearly indicated to help prevent unintended selections.
Map Slot LogicFive Locations.
Five Locations.
One Active Map.
MG Flasher uses Slot 0 as the base/default map location and provides four additional switchable locations where valid data is available.
Default Map
The octane level or calibration selected before flashing becomes Slot 0 and is active after the flash. Slot 0 is always considered valid.
Switchable Maps
Additional slots may contain lower or higher octane calibrations, ethanol blends or custom tuner data. Every active slot must contain valid calibration data.
Selection Blocked
Invalid map slots can be shown as unavailable in Live Control or indicated with a brief tachometer sweep to 7000 RPM through the Custom Code Menu.
Instrument Cluster
Selected Location
Function
0 RPM
Slot 0
Base/default map location
1000 RPM
Slot 1
Switchable custom map location
2000 RPM
Slot 2
Switchable custom map location
3000 RPM
Slot 3
Switchable custom map location
4000 RPM
Slot 4
Switchable custom map location
Control MethodsUse the App or
Use the App or
Your Steering Wheel
Select a valid map slot through MG Flasher Live Control or use the Custom Code Menu on compatible vehicles. Both methods change the active calibration without a new flash.
In-App Control
Open Live Control Guide →
Change Slots in Live Control
Live Control reads the current state directly from the DME and lets you choose an available Switchable Maps slot in real time. Disabled or invalid slots remain unavailable, helping prevent an incomplete calibration from being selected.
✓MG Flasher app version 483 or later
✓Compatible Custom Code installed on the vehicle
✓Current slot shown and synchronized in real time
✓No reflashing required when changing valid slots
Custom Code MenuThe OEM Gauge Shows
The OEM Gauge Shows
Every Map Selection
Switchable Maps uses the combined instrument-cluster logic of the OEM tachometer and Check Engine Light. The tachometer shows the active menu position or map slot, while the CEL identifies the current CCM state.
1K
Switchable Maps in the CCM root menu
1× CEL
Counted submenu confirmation
0–4K
Map Slots 0–4 inside the submenu
1K does not mean Slot 1
Open Custom Code Menu Guide →
In the root menu, 1K identifies the Switchable Maps feature. Only after the submenu opens do 0, 1K, 2K, 3K and 4K represent Slots 0–4.
OEM instrument-cluster feedback
RPM Gauge + Check Engine Light
CCM active
Root-menu position
1K
Switchable Maps
Check Engine LightSlow CEL blinks
The slow blink confirms that the CCM root menu is active.
Step 01 · Root menu
Navigate the OEM tachometer to 1K
While the CEL blinks slowly, move through the CCM root menu until the tachometer points to 1K for Switchable Maps.
Invalid slot feedback
If the selected slot contains invalid data, the Custom Code Menu can indicate the failed selection
with a brief tachometer movement to 7000 RPM.
Interface demonstration only. Exact button inputs depend on the configured UniRocker or RockerCombo setup. Slot availability depends on the flashed OTS map or custom tune, ECU software and installed Custom Code.
Using Switchable MapsFrom Flash to
From Flash to
Active Slot
The public workflow is simple, but the map file, vehicle and Custom Code configuration must all support the feature.
01
Prepare the File
Use a Compatible Map
Select a supported OTS map package or a custom tune with valid switchable map data. Custom tuners must enable the required slots and map switches in the calibration.
02
Flashing Options
Enable Switchable Maps
Enable the Switchable Maps option in the MG Flasher Custom Options menu during the supported flashing process.
03
Choose a Method
Select the Desired Slot
Use Live Control in the app or enter the Custom Code Menu and select Slot 0, 1, 2, 3 or 4.
04
Before Driving
Match Fuel and Hardware
Confirm that the selected calibration matches the fuel currently in the tank and every required hardware upgrade installed on the vehicle.
Full Instructions
Open Full Guide
Need the Complete User Manual?
View the detailed steering-wheel procedure, button configurations and technical notes in the official MG Flasher documentation.
CompatibilityFeature Support Is Only
Feature Support Is Only
Part of the Answer
The vehicle, ECU software, Custom Code version and the map data inside the active file must all be compatible.
Gen 1 B48H / B48 / B58
Switchable Maps is supported on selected compatible F-Series and G-Series Generation 1 applications when the required Custom Code and map versions are available.
Gen 2 B48 / B58
Feature support is available starting with Custom Code v7.1. Selected Gen 2 OTS packages may not provide ready-to-use switchable performance data in every slot, so a compatible custom tune may be required.
Selected S58 Applications
The approved engine content lists Switchable Maps as supported for selected S58 vehicles. Exact ECU software, Custom Code and map availability should be confirmed in the MG Flasher app before purchase or flashing.
Custom Tune Packages
A custom tuner can create and populate compatible slots for a supported vehicle. Every enabled map in every active slot must contain valid calibration data.
Requirement
What to Confirm
Vehicle and ECU
Supported engine platform, generation, ECU software and security status
Custom Code
A compatible Custom Code version with Switchable Maps enabled
Map Package
Valid and populated slot data for the selected OTS map or custom tune
Fuel and Hardware
The selected slot must match the fuel and installed hardware
Before You Buy
Check Your Exact Vehicle in the App
Download MG Flasher, connect through a compatible ENET connection and run Check Support to identify the ECU and available software for your vehicle.
Map AvailabilityOTS Maps and
OTS Maps and
Custom Tunes
Switchable Maps can work with compatible MG Flasher OTS packages and properly prepared custom tunes, but the slot contents are not universal.
MG Flasher
OTS Maps
Compatible OTS packages can include predefined lower- or higher-octane calibrations and selected ethanol blend slots. The selected file and its release notes determine the actual layout.
- Predefined map package
- Slot availability depends on engine and map version
- Available slots can be checked in MyCar / ECU information
- Selected Gen 2 OTS packages may require a custom tuner for populated performance slots
Independent Tuner
Custom Tune
A compatible custom tuner can define which slots are active and which calibration maps change between them, creating a package around the vehicle's fuel, hardware and performance goals.
- Slot-by-slot calibration control
- Only required slots need to be enabled
- Every switched map must be valid in every active slot
- Switchable Maps must also be enabled during flashing
Important RequirementsThe Slot Must Match
The Slot Must Match
the Vehicle
Real-time switching does not remove the normal requirements of the selected calibration.
Use the Correct Octane or Ethanol Blend
Never activate a calibration designed for fuel that is not currently in the tank.
Install Every Required Upgrade
Do not select a map that requires a downpipe, upgraded fuel pump or other hardware unless it is installed and configured.
Upgraded HPFP Required Where Applicable
B58 Stage 2.5 setups referenced in the user manual require a supported upgraded HPFP and downpipe, with the correct HPFP option selected while flashing.
Make Changes While Stationary
Live Control can change engine behaviour immediately. MG Flasher recommends configuring features while the vehicle is stationary.
Map validation:
Disabled or invalid slots cannot be selected in Live Control. Through the Custom Code Menu, an invalid selection can be indicated by a brief tachometer movement to 7000 RPM.
Frequently Asked Questions
Switchable Maps FAQ
Common questions about map slots, compatibility, Live Control and custom tuning.
What are Switchable Maps On-The-Fly?
Switchable Maps allows a supported vehicle to change between available map slots in real time without performing a complete ECU reflash for every change.
How many map slots are available?
Compatible setups can use five locations: Slot 0 through Slot 4. Slot 0 is the base/default calibration, while Slots 1–4 are additional switchable locations.
What can be stored in each slot?
A slot may contain a different octane calibration, ethanol blend, power level or custom tuner configuration. The actual slot content depends on the flashed OTS package or custom tune.
Can I switch maps from the MG Flasher app?
Yes, when the vehicle has a compatible Custom Code version installed. Live Control in MG Flasher app version 483 or later can display and select valid Switchable Maps slots in real time.
Can I switch maps using the steering wheel?
Yes, on compatible vehicles. Enter the Custom Code Menu, navigate to the 1000 RPM Switchable Maps submenu, select Slot 0–4 and confirm the selection using the supported UniRocker or RockerCombo configuration.
Why is a slot disabled or marked invalid?
The slot may be disabled in the calibration or may contain incomplete or invalid map data. Live Control blocks those slots, while the Custom Code Menu can indicate an invalid selection with a brief tachometer sweep to 7000 RPM.
Do Switchable Maps work with Gen 2 B48 and B58 vehicles?
Switchable Maps feature support is available for selected Gen 2 B48 and B58 vehicles starting with Custom Code v7.1. However, selected Gen 2 OTS packages may not include ready-to-use performance data in every switchable slot, so a compatible custom tune may be required.
Can a custom tuner create my map slots?
Yes. A compatible custom tuner can enable the required slots, choose which calibration maps switch between them and populate every active slot with valid data for the vehicle's setup.
Can I switch to a higher-octane map before adding the correct fuel?
No. The active calibration must always match the fuel in the tank and the hardware installed on the vehicle. Selecting an incompatible map can create unsafe operating conditions.
Ready to Get Started?Find the Right Setup
Find the Right Setup
for Your Vehicle
Check your engine, confirm ECU compatibility and explore the correct MG Flasher maps, Custom Code and license options.