You do not need to touch the Bolts. And you will not budge them no matter how hard you turn them in either direction they are designed to act as mounting posts rather than bolts,
As Kurt has advised you need to take the plastic cover off I think it has 3 phillips head screw's (that covers the wiring) on the non drive side. And you will see three nuts in that space.
It is easier upside down that is for sure but,
If you are going to turn your bike upside down then get some bits of wood or something and place them under your grips to stop your display, gear pods etc getting knocked or scratched.
Edit, you will also have to remove the chainring and spider first.
As Kurt has advised you need to take the plastic cover off I think it has 3 phillips head screw's (that covers the wiring) on the non drive side. And you will see three nuts in that space.
It is easier upside down that is for sure but,
If you are going to turn your bike upside down then get some bits of wood or something and place them under your grips to stop your display, gear pods etc getting knocked or scratched.
Edit, you will also have to remove the chainring and spider first.
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