There are only two main voting machine vendors in the U.S: Dominion & ES&S. If you add Hart, between them they cover about 88% or more of U.S. voting jurisdictions. The simplest way to do this would be to hack into the systems of the two main companies using an Advanced Persistent Threat model similar to what was used in the Salt Typhoon hack, which may have gone on for as long as two years.

Plant malware in the updates of the two main vendors systems. Then the vendors will install those for you.

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