Conviction requires proof beyond a reasonable doubt — all the onus is on the prosecution to prove that you indisputably committed that crime. In this case unreliable evidence was used without which this standard likely would not have been met.
Once you’ve been convicted (in this case on shoddy evidence) the onus is on you to offer evidence that you’re actually innocent - a reasonable doubt is no longer sufficient, you need to offer strong, new evidence that disproves the already decided “fact” that you committed the crime.