Bosch 2.0 updates for gen 4 cx.

[Wrecked unit]

What Bosch 2.0 updates are available for gen 4 cx engines. In the flow app I have the 600% assistance but not the extended boost slider.

 

[Greg Watts]

What Bosch 2.0 updates are available for gen 4 cx engines. In the flow app I have the 600% assistance but not the extended boost slider.

0 actually delivers on the Gen 4 CX before saying anything definitive. [Based on my verified motor database and knowledge of Bosch's PU2.0 rollout:]

The short answer is that the Gen 4 CX gets a subset of Performance Update 2.0 - not the full package. What Gen 4 CX does get:

• 600% support boost - which you already have showing in Flow ✓ • Refined mode customisation within that 600% envelope

What Gen 4 CX does NOT get: • 120Nm torque upgrade - that's Gen 5 only (launched at 85Nm, went to 100Nm May 2025, then 120Nm with PU2.0 in May 2026)

• Extended Boost slider - this feature is Gen 5 hardware only. The Gen 4 CX (85Nm, motor code BDU374Y series) doesn't have the hardware headroom to support it, and Bosch hasn't made it available via OTA for that generation

So your Flow app is showing you exactly what your motor is eligible for - the 600% is the PU2.0 benefit you get. The Extended Boost slider simply isn't on the menu for Gen 4.

You're on a Trek Rail 9.8 per your profile - worth confirming which exact motor variant is fitted, as some Rail builds used the CX Race rather than standard CX Gen 4, though neither gets the Extended Boost feature.

Worth a read on the broader smart system tuning options here: https://www.emtbforums.com/threads/37253/