This would prevent any tampering of the software after it has been hash checked at the time of manufacture.
THEN, you would need to standardize all machines across the board, mandate every state use the same one. Once the baseline is secured, established and verified, there can be no tampering of code.
The real problem is, the voters are the only ones who want it fixed and fair... so efforts to secure the systems will never be of interest to those who can actually make it happen.
It is so simple a Caveman could do it, if the Marxists were not in control.
People seem to have an abnormal amount of trust in shiny machines that they can touch and see results. Of course the real fraud is easiest with the scanners that read and record results from paper ballots.
We will have to give up the secret ballot, by using a thumb print or even DNA so you can check to see if your vote was tabulated they way you cast it. The chance any of that will happen, near absolute zero.