/E/Foundation Rom back to Oreo after Pie

Hi

After installing /E/ foundation rom with TWRP (did first Your onlock guide THANKS!) on Samsung Galaxy S8 SM-G950F .
I want back to stock samsung Oreo.(I want the Call recoder Back!) Pie was before installed, will that work?
And TWRP still working after that?
I wil use ODIN to flash the Oreo rom over the /E/ foundation rom.

Thanks in advance

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Yes twrp works for the exinos models

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There is a call recording app you can use, not sure if it requires root.

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