@Bigv Do you have a check engine light now? This would mean there is another problem with your engine. Checksum errors don't trigger the CEL and can be ignored as long as the engine starts and runs without problems.
I can't help you with VIDA. Subscriptions for legit VIDA are only available for private users in the US, while I live in germany. Cracked offline versions like VIDA2014D are not able to do software reloads. Your tuner should have made a backup of your original software and should be able to restore it.
Reverting to stock software would also require to remove the blanking plate as the EGR would be reactivated.