Did you read what they write in the FP shop about the new display?
We are now offering a newer version of the Display module. In order for the replacement to work properly, please make sure your phone is up to date.
If you are able to still update your phone with the broken display you should do so. The older firmwares don’t seem to be able to talk to the new display. I don’t know if there’s a way to update the phone if you cannot do it with the broken display, maybe someone else can help here.