how do i reinject a new save into the rom of a repro cart?

[GBAtemp]

hey all,
so yeah I basically have my old repros sitting around decided id dump the save as ive been playing emeral and lead green recently again,
I managed by using a gbxcart pro to get to the save by dumping the rom and using a save extractor tool which works in pkhex and I have made the changes to the save,
just wondering now how to inject the save back into the rom so I can rewrite it to the card?

I have used my gbxcart to write roms and such before anyways so writing it back wont be...

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Source: https://gbatemp.net/threads/how-do-i-re ... rt.629033/