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This sounds correct to me, given the wording of the gov.uk page on EAPCs. It seems like there needs to be 3 things in place in order for the OSF TSDZ2 to be legal in the UK (I'm not a lawyer :) ) 1. "electrical assistance must cut-off when the vehicle reaches 15.5 mph" (already in place) 2...

Thanks for all the feedback and suggestions. I changed the street power limit to 500W and that made a huge difference. I may also up the current from 12A. I have a manufacturer's sticker on the bottom of the motor that says 250W 48V 15A.

These are my battery settings, which I believe are correct: And these are the settings for Street Mode: I notice that when I turn Street Mode OFF, I can power up the hills with no problem, so I'm pretty sure it's that 250 Street Power Limit that is causing hills to be so difficult in...

I don't think the motor is cutting out, more that the assistance isn't enough, given the weight of the bike. Interestingly, if I turn street mode off (which increases the max power to 500W) I fly up the hills, which is why I wondered if the 250W limit means that the firmware doesn't do bursts of...

It was sold as a 250W 48V TSDZ2 if that's what you mean? I should say, that with the stock firmware, there was noticeably more power up hills at level 4 than the OSF but perhaps that's because I'm using the wrong assist type?

I have successfully flashed my TSDZ2 with the emmebrusa firmware. I've set the "Street Power Limit" to 250W as I'm based in the UK. This keeps it legal, but it appears to stop the motor from "peaking" above 250W when I climb hills--a relatively steep hill and I have no assistance from the motor...