The processor had a really strange thermal pad made up of ferrite material, anyone know why this would be used over a normal style thermal pad? I haven't seen this kind of thermal pad before

@aleksorsist making sure the discharge does not flip a bit or two, not sure which AED model you have there, but a typical biphasic defibrillator can discharge >300J, which typically means >1500V switched. A lot of potential for EMI interference, and an application where a bitflip could mean a much stronger discharge than intended