It's hard to see from the photos but possibly could be persuaded back on and then torque up the bolts correctly and all good?
This was attempted but fell right off after the bolts were tightened with the allen key. The crank does not stay on at all anymore
Are you saying the pinch bolts on the crank arm will not tighten? The axle splines and the interface for them in the crank look good enough.
@ImranKabir started
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It's hard to see from the photos but possibly could be persuaded back on and then torque up the bolts correctly and all good?