The Bosch 11.13.0 update deployed in April 2024 via the eBike Flow app rendered SpeedBox 1.0, 1.1 and 1.2 (ordered before May 2024) inoperative on Bosch Smart System motors. If you have any Bosch tuning kit installed: disable automatic updates in eBike Flow immediately and verify compatibility before every firmware update.
eBike Firmware Updates & Tuning Kits — What You Must Know Before Updating
Every firmware update can silently strengthen your motor's detection algorithms — or brick an otherwise working tuning kit overnight. This guide covers the risks by motor brand and explains how to protect your kit before updating.
Why firmware updates matter for tuning kit users
Ebike motor manufacturers (Bosch, Shimano, Yamaha, DJI) publish regular firmware updates to add features, fix bugs and improve performance. But these updates also modify the motor's internal software — including its anomaly-detection routines.
A tuning kit works by modifying the signal sent to the motor controller. When Bosch or Shimano refine their detection algorithms, an update can make a previously undetectable kit suddenly visible — or simply non-functional.
The most documented example is Bosch firmware 11.13.0 (April 2024): pushed automatically through the eBike Flow app, it broke compatibility for SpeedBox 1.0, 1.1 and 1.2 units ordered before May 2024. Hundreds of users found their kit non-responsive overnight, with no prior warning.
A second, often underestimated risk: the eBike Flow app (Bosch) and E-TUBE Project (Shimano) can push updates automatically if you do not explicitly configure them otherwise. A Bluetooth connection while charging your bike in the garage is enough to trigger an unwanted update.
The universal rule: disable auto-updates if you use any tuning kit
Regardless of your motor brand or kit type — disable automatic firmware updates in your motor app. Accept updates only after confirming compatibility on your kit manufacturer's website. There is no firmware rollback on modern Bosch or Shimano systems: once updated, you cannot go back.
Rules by motor brand
Bosch Smart System (Gen4, Gen5, SX)
How to freeze Bosch firmware — step by step in eBike Flow:
- Open the eBike Flow app on your phone
- Connect to your bike via Bluetooth
- Tap the menu icon (top-right) → Settings
- Select Firmware Updates
- Toggle Automatic Update to OFF
- You will still receive update notifications — do not accept until you have verified compatibility on speedbox-tuning.com, volspeed.eu or your kit manufacturer's site
- Never accept an update offered by a dealer or workshop without verifying yourself first
- Older Bosch Gen2 and Gen3 motors (round connector) use eBike Connect — less impacted, but caution still applies
Shimano EP8 / EP801 (and E series)
- The E-TUBE Project app (iOS / Android) pushes updates via Bluetooth — set it to manual update mode before connecting to a bike with any tuning kit installed
- Do NOT update if you have a tuning kit fitted, especially on EP8 / EP801 — verify compatibility on peartune.com or your kit manufacturer first
- The EP801 Race Tune firmware (2025) removes the speed-assist cutoff in Race mode natively — favourable for tuning users, but the update process itself can alter detection; check kit compatibility before accepting
- Error code E299 (permanent lock) is the major risk on EP801: never force a kit reconnection after an incompatible update
- EP801-safe kits: PearTune MSO 3.0, BadassBox 4, Eplus Flash — see the Shimano tuning guide
Yamaha (PW, PW-X, PW-X2, PW-X3, PW-C2) — PW-LINK firmware
- Physically disconnect your kit before any firmware update via the Yamaha app — unplug the kit connectors, not just the battery
- Updating with a kit still connected can cause a non-reversible initialisation error on some PW-X3 units
- Reconnect the kit only after restarting the bike and confirming the motor system is stable
- Check compatibility bulletins on your kit manufacturer's site before accepting any PW-LINK firmware update
TQ HPR (HPR40 / HPR50 / HPR60)
- Check speedbox-tuning.com for TQ compatibility bulletins before any update
- Low current risk, but apply the same precaution: disable auto-updates in the TQ app if a kit is fitted
DJI Avinox
- Disable automatic updates in the Avinox Ride app if a kit is installed
- Consult your kit manufacturer before every Avinox firmware update
How to check if your kit is still working after an update
- Fully restart the bike (power off + power on) after any firmware update
- Check the display for error codes. On Bosch, errors 503 or 507 can indicate a kit conflict. On Shimano EP801, E295 is the early warning before the irreversible E299
- Test kit activation using the normal procedure (Walk Assist held, dedicated button, etc.) in a safe area at low speed
- Confirm speed-assist behaviour: in tuned mode, motor assistance should continue above the legal cut-off. If assistance drops at the legal limit, the kit is no longer functioning
- If everything is normal, note the installed firmware version (visible in the app) — useful reference if a problem arises later
What to do if your kit stops working after an update
Do not repeatedly disconnect and reconnect the kit, or force pairing. On Bosch Smart System motors, each failed connection attempt with an incompatible kit can increment an internal error counter. Too many errors can trigger a lock that is difficult to reset even at a dealer workshop.
- Contact your kit manufacturer immediately. SpeedBox, PearTune, BadassBox and others typically publish a compatibility update within weeks of a problematic firmware release. Have your order number and installed firmware version ready.
- Leave the kit in place but inactive while waiting for a compatibility update. Do not remove it unless you are certain of the correct deactivation procedure — some kits must be deactivated before disconnection to avoid a motor error.
- Keep your bike usable in standard mode during this period. The legal speed limit will be active, but the bike functions normally.
Firmware rollback — why it is not possible
On modern Bosch Smart System and Shimano EP801 motors, rolling back to a previous firmware version is not possible. Firmware packages are cryptographically signed and the motor unit rejects any version lower than the currently installed one. No official or third-party tool exists to downgrade these systems.
Prevention is the only effective protection. Once an update is installed, you cannot reverse it — you must wait for a compatibility update from your kit manufacturer.
Pre-update checklist — before accepting any firmware update
Choose a kit with a proven firmware update record
SpeedBox publishes compatibility bulletins within days of any Bosch or Shimano firmware release. BadassBox 4 (external) is immune to motor firmware changes — it never interacts with the motor electronics.