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ok - as a final wrap.
what should have happened
1.on old device you use the export all calibre data .[ i dont know how / if calibre verifies that the export is good]
2. you install calibre on new device. it will show no book, no library because you now have to do this: choose import all calibre data. Calibre should ask from where? and should then ask you for a folder location to import to, it will thenimport your library and settings, and metadata , putting the library in that location, and then will auto restart so that after a restart it is showing the imported library, metadata etc.
after that restart u you can use it as normal.
in your case, something went wrong. either you encountered a bug, or or did something out of sequence. neither case is easy to troubleshot remotely.
if you wanted a final try and you have the exported data, you could carefully repeat the import process, and stop immediately if you don't get the desired result, don't mess with it, just report back saying what you did and what you saw.
but if you have already manually fixed your lost metadata, you may not want to risk that.
personally, as said before, I do not and would not use that method, because it is a black box solution which is difficult to troubleshoot. I would use the already outlined method oc making windows copies of relevant folders , and adding those to the new device. that has the advantages that it gives you a usable backup, and it is transparent. you can at each stage check that the folder copies exactly match what you are copying from.
as for metadata.db, it is a database file which calibre uses for all the books' metadata. each calibre library has one. if it goes missing calibre will report no library at that location. it is specific to a library - you cannot take a copy from library A and use it library B. A search will give more info you want more details
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