I updated the EP801-RS in my 2025
Orbea Rise LT H10 to the new (8th October 2026) 4.6.0 firmware last week via the E-Tube app. The firmware flashed with no issues however on the first ride after updating the bike felt noticeably sluggish and lacked its usual punch and power compared to the previous ride.
Checking in E-Tube, my custom profile (de-tuned for range) was still active so I reset it to the default profile then back to my custom one, however it made no difference. I ended up increasing the Assist Character by 2 notches for both Eco and Trail (I left Boost alone since I rarely use it) which brought the power and feel back to what I was used to, but the obvious downside is that it is now using noticeably more battery on my usual loop (10-15%).
A few extra details:
• The
Shimano Firmware changelog only lists "general bug fixes" for version 4.6.0, with no mention of torque or assist profile adjustments.
• The bike was on the immediate prior firmware version before this, running perfectly with no power issues.
• There are two old error codes logged in the app (E201 & E914) but they are from September 13th (over 100 miles ago) and haven't re-occurred since.
• The bike is 10 months old and has covered 1021 miles.
I've already contacted Madison (the UK distributor), and they are escalating the query directly to
Shimano. I also contacted
Orbea however they have said they have no input into
Shimano updates.
In the meantime, has anyone else noticed a sudden drop in assistance or a more sluggish ride feeling after a firmware update? If so, did you manage to fix it without affecting the battery life?