Flashing firmware to XM+ with Flysky FS-i6 transmitter

I tried to bind my XM+ reciever to my FS-i6 transmitter and when I try to bind it I get a solid green and red light, which according to Project Blue Falcon, I have an incompatible firmware.
So I want to flash firmware to my reciever but he shows how to do it on a Taranis, therefore I dont have some of the pins and memory access like him.
Anyone know how to do it with FS-i6?
Adding link to remind you the proccess.

frsky is not compatible with flysky,
you need a frsky radio to talk to a frsky receiver and vice versa.
no matter what firmware you flash on your xm+ or your fsi6, they will never work properly.

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Thanks for the quick response!