Hard drive full but no files on it.

This is about a Meizu m6 SL.

So yesterday I formatted the player because I accidently put on Hebrew firmware and then i put 2.0004.6 on it and made it english. But when I look at the memory available it says that it only has a few mb, but there are no files on it!

Could somebody explain me what happened?

I personnaly think that the old files didn't get deleted from my Meizu but stayed on it but not in a way that I can browse them.

Thanks in advance,

[x] I have read mbarry's guide
[x] I have read the FAQ
[x] I even used the Search function but couldn't find anything useful
[x] after doing all the above, I still have a specific problem which is ________________________________________

Found the solution. Which actually was very easy. I formatted with it turned off. Explains why it didn't work earlier.

Lock please