Compatibility with Firmware 4.21.0

[hg8]

Hey 👋

First of all I know you don't own a C4, I am creating this issue to see if there is a possibility of collaboration with the community to debug and test fix for this problem.

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Firmware 4.21.0 ("AdaptivePower 2.0") included a lot of changes, for example it's the first time in 2 years that an update reverted my Untamed settings.

Once setting again "Torque (no speed limit) + Field weakening" in the app the bike mostly works fine and behaves as expected, expect that the engine completely shut off when starting from a stopped position (It kind of feels like engine protection or something ?). The bike is still on but the engine won't work at all until you re-lock and unlock the bike (doesn't even work every time). When reverting to "Torque and speed limit" from the Untamed app, the problem fully disappears.

I tried various field weakening settings but none changed the issue. Any idea on how to debug this issue or what could be the cause ?

Thanks!

EDIT: Or alternatively, if anyone knows a way to revert to a previous firmware version ?