I'd also refer you to this comment to better understand the context behind this FUD: #197505
MK3 v4.1.8 + MK4 v5.1.2 reproducible build by Erik Nylund
https://gist.github.com/eriknylund/811b7f23154268dadfc84058a6f2cdc8
Rob Hamilton running the latest MK3 firmware 2023-06-19T 1627-v4.1.8:
https://twitter.com/Rob1Ham/status/1671615542262657025
Demo on how to run MK4 repo builds by Praveen Perera: https://twitter.com/PraveenPerera/status/1671618928265576448
Did you see the follow-up thread as well? https://twitter.com/nvk/status/1671856113484955648