Bosch Performance Upgrade 2.0: What really changes with the new update
The important things first: Performance Upgrade 2.0 is more than a normal app update.
Many drivers are talking about the "Bosch 120 Nm update" or the "CX 2.0 update." However, the technically more accurate term is: The Performance Upgrade 2.0 is a smart system update package. It affects the eBike Flow app, which Drive Unit and, depending on the equipment, also the way driving modes, sensor values and external devices interact.
At the beginning of May 2026, Bosch announced after the Drive Unit Firmware 19.55.0 Performance Update 2.0 for the Bosch Smart The system has been rolled out. As part of this update, firmware version 19.54.0 was initially released. A further minor update, firmware 19.55.0, is now available, which currently mainly includes optimizations, minor adjustments, and bug fixes. Of particular importance for users of the EBTsmart Unlock Key: Compatibility with the new firmware versions has been confirmed since May 6, 2026.
eBike Flow App
The Flow app serves as an update and settings interface. It displays available updates, allows users to adjust driving modes, and integrates new functions such as external data sharing or annual statistics.
Drive Unit
The Drive Unit From a technical point of view, this is the core. It houses engine control, torque maps, support logic, speed signal processing, and plausibility checks.
Remote, display, battery, ABS
Control units, displays, batteries, ABS, eShift, and ConnectModule can have their own software versions. They are important, but usually not the main factor for tuning compatibility.
Which Bosch motors benefit from the Performance Upgrade 2.0?
The update doesn't apply to all Bosch e-bikes. The decisive factor is the Bosch system ecosystem. Classic Bosch systems without the eBike Flow app generally belong to the BES2 ecosystem. Performance Upgrade 2.0, on the other hand, concerns the Bosch Smart System, i.e., BES3.
| Engine / Drive Unit | BDU identifier | Update relevance | Important notes |
|---|---|---|---|
| Performance Line CX-R | BDU386Y | 120 Nm and up to 600% support | Top model in Smart System; particularly relevant for sporty e-MTBs. |
| Performance Line CX Gen5 | BDU384Y | 120 Nm and up to 600% support | The update is the focus of many test reports and practical reports. |
| Role Line | BDU384Y | 120 Nm and up to 600% support | Relevance especially with heavy loads and low cadence. |
| Performance Line CX | BDU374Y | up to 600% support | Not automatically identical to Gen5; check exact BDU. |
| Performance Line CX Race Limited Edition | BDU376Y | up to 600% support | Special case for sports; observe mode and manufacturer approvals. |
| Role Line | BDU374Y | up to 600% support | Check depending on system configuration and release. |
| Performance Line PX | BDU347Y | up to 600% support | Smart system variant with its own classification. |
Important: 120 Nm does not apply universally to all vehicles. Bosch Smart-System motors. The exact details are crucial. Drive UnitThe BDU identifier, the manufacturer's approval, and the specific system configuration are required. The designation "Bosch CX" or "Gen5" alone is insufficient for a reliable classification.
Note on the BDU logic: Specifications such as "Bosch CX", "Gen4", "Gen5" or "Smart System“These details are often insufficient for a reliable classification. The precise BDU identifier is crucial.” Drive UnitYou can find these in the eBike Flow app under the drive unit components.Why Drive Unit 19.55.0 is particularly important for tuning.
The Performance Upgrade 2.0 is often described via the eBike Flow app. However, the motor firmware is crucial for a technical evaluation. Drive Unit It processes data from the speed sensor, cadence, torque, riding mode, battery, and other system components. Therefore, the firmware version of the Drive Unit From a tuning perspective, this is more important than the pure app version.
New maps
The update changes the torque and support maps. This primarily affects how additional power is released, limited, and regulated depending on the situation.
More sensor calibration
The more dynamic the engine control system, the more important the interplay between speed, cadence, pedal pressure, driving mode and terrain interpretation becomes.
All the important innovations of the Bosch Performance Upgrade 2.0
The update doesn't just change individual numerical values. It primarily alters the engine's behavior off-road, during acceleration, on steep ramps, and under varying traction conditions.
Up to 120 Nm torque
Selected Smart System motors receive an increase in maximum torque. This can be particularly noticeable when starting off, on steep inclines, and at low cadence.
Up to 600% support
The maximum support level increases to up to 600% on certain motors. Important: Bosch limits this maximum support to the low speed range up to 15 km/h.
750 W remain unchanged
According to the latest test reports, the maximum peak power remains at 750 W. Bosch is therefore not simply increasing the peak wattage, but rather changing the torque, support level and control quality.
More progressive power development
Many drivers describe the update as more controlled, predictable, and offering improved traction. The engine feels less abrupt and delivers power more smoothly.
Improved climbing properties
The bike should remain more stable, especially on steep, technical climbs. Less wheel spin, more control, and better power delivery are the key practical advantages.
Extended Boost adjustable
The motor can provide a brief boost even when the rider stops pedaling. This helps when going over steps, roots, and rocky edges. A new feature is the finer adjustment via the eBike Flow app. According to current reports, the ability to individually adjust the extended boost duration should be available from summer 2026.
Drivetrain Tensioner
This software function is designed to reduce free play in the drivetrain. This makes the power transmission feel more direct, especially in sporty modes. Currently, Bosch is introducing the drivetrain tensioner primarily in... Performance Line CX and CX-R; initially, the function will be particularly relevant in the eMTB+ and Race riding modes. This makes the power transmission feel more direct, especially in sporty modes.
Garmin integration
Bosch opens live data of the Smart Systems for compatible external devices. This includes information such as battery level, range, cadence, user power output, and support mode.
12A fast charger
Additionally, a new 12A fast charger has been announced. According to recent reports, Bosch is using GaN technology for this charger; it is expected to be slightly smaller than the current 4A charger and is slated for release towards the end of 2026. This is more of a hardware issue and not directly related to tuning compatibility.
What role does the eBike Flow App 1.35 play?
The Flow app is the visible interface of the update. That's where the... Performance Upgrade 2.0 was offered, installed, and then configured in the driving modes. However, the app is not the same as the drive unit firmware.
| Component | Task | Importance for tuning |
|---|---|---|
| eBike Flow App 1.35 | View updates, install updates, configure driving modes, share external data. | Important, but not the technical core. |
| Drive Unit 19.55.0 | Motor control, torque, support, sensor processing, plausibility logic. | Very important; key checkpoint. |
| LED Remote / System Controller | Operation, display, system communication. | Relevant, but mostly secondary. |
| Kiox / Purion / Display | Display and operation vary depending on the system. | Relevant for system status and customer management. |
| ABS / eShift / Battery | Special functions with their own system logic. | Important for special configurations. |
What does this update mean for Bosch Tuning?
The Bosch Performance Upgrade 2.0 doesn't just change performance figures. More importantly, it changes how the engine delivers power. Therefore, when... Bosch Smart In the future, the system will be examined even more closely to determine which firmware, BDU, and sensor logic are present.
Here's how to check your Bosch system after the update
Before selecting any product, the system architecture, BDU, firmware version, and special features should be checked. Simply stating "Bosch CX" is not sufficient.
Open the eBike Flow app
If your bike is connected to the eBike Flow app, then it's the Bosch Smart System / BES3.
Call up components
Open the e-bike settings and then the component overview.
Select drive unit
There you will find the exact engine designation and the BDU identification of the Drive Unit.
Note the firmware version
Note the software version of the Drive Unit. With current bikes with Performance Upgrade 2.0 should be the software version of the Drive Unit will be examined particularly closely; version 19.55.0 is currently especially relevant.
Check wheel magnet, ABS and eShift
Check if your bike has a wheel magnet, ABS, or eShift. These features can affect the product selection.
Which solution is suitable after the update?
The following overview does not replace an individual assessment, but it helps with initial orientation.
| System | Typical sign | Initial orientation |
|---|---|---|
| Bosch BES2 / Gen2–Gen4 without Flow App | Purion, Intuvia, Kiox or Nyon without eBike Flow app; usually a classic charging port. | EBT Unlock Key or check classic BES2 products. |
| Bosch Smart System without rim magnet | eBike Flow App, LED Remote, System Controller, Purion 200 or Kiox 300/500. | Check the EBTsmart Unlock Key for the digital solution; note the hardware sensor position. |
| Bosch Smart System with rim magnet | Magnet on the valve, on the rim, or no classic spoke magnet visible. | Check EBTsmart Unlock Key or EBTsmart Switch; distinguish between BDU37 and BDU38. |
| Bosch Smart System with ABS | ABS components on the bike, often additional sensors and their own system logic. | No general chip/sensor recommendation. Test the EBTsmart Unlock Key up to 32 km/h. |
| Bosch Smart System with eShift | Electronic or assisted switching logic, possibly gear sensor. | Special case; check the digital solution first. |
Internal short logic for support and consulting
For customer inquiries regarding Bosch Performance Upgrade 2.0 shouldn't be decided solely based on "Gen5" or "CX". The safe order is:
Frequently asked questions about Bosch Performance Upgrade 2.0
Is this Performance Upgrade 2.0 is the same as Drive Unit 19.55.0?
no That Performance Upgrade 2.0 is the complete feature package. For tuning questions, the firmware version of the Drive Unit This is particularly important. Currently, version 19.55.0 should be tested; however, the specific combination of BDU, firmware, sensors, and special equipment always remains crucial.
Is the eBike Flow App 1.35 the only decisive factor?
No. The app displays the update, installs it, and allows you to configure settings. However, the actual engine logic resides in the Drive Unit.
Everyone gets it Bosch Smart System Bikes 120 Nm?
No. 120 Nm is only for selected models. Drive UnitThis is provided for. Furthermore, the bicycle manufacturer can limit the approval if the frame, drive system, or components are not designed for higher loads.
Does the 600% support always apply?
No. Bosch only specifies the 600% support up to 15 km/h and only for certain motors and driving modes.
What does the update mean for classic Bosch Gen2–Gen4 systems?
Classic BES2 systems without the eBike Flow app are not part of the Smart System update world. Different firmware versions and product recommendations apply to these systems.
Why is the wheel magnet so important?
At the Bosch Smart The system's method of speed measurement significantly influences the most suitable solution. A bike with a rim magnet requires a different approach than a bike with a classic spoke magnet or slim sensor.
What information should I have ready before making a request?
Ideally: Bosch system world, exact BDU identification, drive unit firmware, magnet type, ABS yes/no, eShift yes/no, desired solution and existing displays or control units.
Conclusion: Bosch does this Smart System more powerful and complex
The Bosch Performance Upgrade 2.0 is not just a minor comfort update. It significantly alters the motor characteristics of selected Smart System e-bikes. More torque, increased support, finer control, adjustable Extended Boost, and external data sharing make the system more modern, but also more sophisticated.
For drivers, this means more control and more power off-road. For selecting a suitable tuning solution, it means that firmware, BDU, magnet type, and special equipment must be examined more closely than before.
Legal notice: Modifying e-bikes is not permitted on public roads. E-bikes modified in this way may only be used on private, non-public property. Please observe the warnings and legal regulations.
Stand: May 2026. Software versions, manufacturer approvals, and compatibilities are subject to change. Always check your exact system configuration before purchasing.
