What would happen if digital evidence didn't much what was on physical evidence?

Lets say if someone has a court case going on where 99% of the evidence is digital that they are using to covict him. What would happen if nothing they said was on the defenders phone?

Like they said the defenders Was scamming millpns of people online and we have Digital evidence Screenshots that he kept on his phone to brag to his friend about that we made copies of. the defenders says the fbi planted evidence on him and that they didn't get any of it from his phone says he's inccoent. that if is phone looked at none of it would be there. What would then happen if none of what the FBI said they got from his phone waa on it?
What would happen if digital evidence didn't much what was on physical evidence?
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