Updatet to 4.01 with the hope that the Bug wirth the corrupt Database is solved. But…No! Still the same 
It looks like downgrading Engine DJ to 3.4 and leaving Engine OS at 4.01 will work.
Please Denon solve this!
Greetz Kai-Uwe from Germany
They are working on it. The solution is complex.
Always backup your databases before upgrading.
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How do you know that? Hope you are Right!
Various sources 
, including speaking to the team themselves.
Long story short, the issue is complex and requires creative thinking, engineering and testing. Find a bug, rinse and repeat.
While I don’t work for Denon, I software engineer by trade (over 25yrs experience). I also experience this issue and it’s a personal passion of mine to help this community deal with it.
7 Likes
Having seen your previous replies on this issue and on others, i think Denon needs to get you a job!
3 Likes
“Why buy the cow when you can get the milk for free”
Seriously it’s all good 
Que tal querida comunidad, soy de Chile y la actualización de mi Denon Prime 4+ no ha tenido problemas de datos de base corruptos, pero si en la lectura de discos duros el cual no los reconoce. tengo 3 discos duros con formato fat pero no lo toma, favor si me pueden ayudar con eso, saludos querida comunidad DENON.
Hello dear community, I am from Chile and the update of my Denon Prime 4+ has not had problems with corrupted base data, but it has had problems with reading hard drives which do not recognize them. I have 3 hard drives with fat format but it does not take it, please if you can help me with that, greetings dear DENON community.
Hi,
I’m sorry but I hope someone can help me here. I was also affected by the corrupted files and reverted to 4.0.0
For whatever reason the backup was also corrupted and I had a blank backup except for two tracks. I copied the “backup files” from my 4+ and replaced the files on the laptop. So the crates etc are all back but the tracks can’t be used since the program doesn’t know where they are. I don’t have them on C: I have them on E: Is there a way to say Engine Prime to look for the tracks (like it always did so far) on E: and not on C:?
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