Hello
Ok I got the same original box, burnt a clone so I took back the one I gave to my sister
so the only way is to remove the little chip with the yellow dot, I suppose desolder it and solder
this :
https://jam3.japhar.com/japhar/index.php/product/sim-socket/ ?
so I can use one of my japhar sim

Thank you for feedback

edit :
I suppose you need to flash FIRST secondstage-dm800sev2_allsim.nfi before removing chip or ?