Stock rom installation via custom recovery Note 5 N920i

Hi there,
I'm running Dr Ketan's M6 on my N920I with TWRP recovery installed.
Now i want to flash latest Official FW PE3
Is there any way to flash stock rom via custom recovery, without ODIN?
Can i retain custom recovery?
And is there a, way to flash stock rom with custom recovery?

Help pls.

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