If you are using an SD card, you can simply mount the partitions on the card and edit the file before putting it in the board.
You can also mount the partitions inside an eMMC image (I believe) but that's more involved as you need to know the offset where it starts and so on.
If you are using an SD card, you can simply mount the partitions on the card and edit the file before putting it in the board.
You can also mount the partitions inside an eMMC image (I believe) but that's more involved as you need to know the offset where it starts and so on.