I changed my op-z because of double trigs and now when i try to restore my backup, i can’t have my presets back. By presets i mean the settings you save the white keys (track + holding white key).
I tried different backups, different firmware versions, the method of electrafa
Yes, you can’t import the userPreset.dat if there’s not already one. so after a factory reset you need to save at least one preset, the OP-Z will create the userPreset.dat and you will be able to overwrite it
If you have ideas to help me you are welcome 
Well, answer to myself… “resolved”
it’s looks like there is a problem about the redmountpack when restoring backups, i had to transfer it via the app otherwise the slot was empty. Once i restored every packs via the app, and restored the backup, still no user presets on the white keys. So i dit the technique above (after a factory reset you need to save at least one preset, the OP-Z will create the userPreset.dat and you will be able to overwrite ). Didn’t work… but previously i saved on my computer the userPreset.dat (freshly created). So what i did on my op-z was overwrite it with my old userPreset.dat and re-overwrite with the one on my computer.
Get back my presets
Love the op-z but pain in the ass sometimes
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I had to dig to find this post, I had the same situation, TE replaced my OP-Z because it would intermittently not connect with the Line Module when it started up. I restored my backup from before I shipped it and I was able to play all synth tracks, but NO Drum tracks. All the sound folders were dead. So I did what you recommended and created a preset and deleted it and it slowly brought back all the drum sounds. I also turned it off and back on to hopefully hasten the process and solidify the drum track sounds. I have had to do a various number of other factory resets on my OP-Z, before replacement and after, when I leave it plugged into my MacBook Pro, which is 99% of the time, sometimes when I turn it on, it goest straight to update mode. I turn it off and back on, still no change, unplug and replug in, still the same. Different cables, nothing works. Starting up with P or T button held, no change, still goest to update mode. So I have to remove the battery and put it back in, and then it starts working again, but sometimes removing the battery causes it to factory reset. This other issue I have not determined what is causing it, but at least now I know how to fix the preset issue better when it does. Thanks for your post.
Glad it helped 
Yeah there are some bothering issues sometimes…
Have a nice day !