need help getting my Samsung A3 2017 (SM-A320FL) back to stock state / odin fail

I messed around with my phone and caused many problems. First being I can no longer flash stock firmware to phone

However if I uncheck BL it works but my sim isn't detected by my phone.
I've been searching for fixes for two days now and I just want my phone back to its original state
The phone is a Samsung A3 2017 (SM-A320FL)
I'm from the UK
And i'm with Three

Thanks,

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