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The concept of "line" in a file made of random garbage data has no meaning.

One way to change byte 13 of testfile1 to "A":

echo "A" | dd bs=1 conv=notrunc seek=13 count=1 of=testfile1

Here we are spiting that string into multiple fields.
n= Total number of fields.
P= This is an array which stores those fields from index as 1 to n.

$ echo "first-second-third" | awk...

OR..

awk '{n=split($11,P,"/");print $2 " " $5 ";" $7 ";" $9 ";" P[n]}'