[Q] Wrong data partition size

Hey guys!

I'm coming to you at the end of a loooong way after trying to upgrade to KitKat.

I started the upgrade to 4.4, on the go, and quite confident. What a mistake ...
The upgrade failed, and my device got bricked. Fortunately, I had the recovery partition. Unfortunately, I destroyed the recovery partition by mistake...
I finally succeed to fix the things, but I have no idea how exactly I did it (I just tried the things as they were coming, messing around with partitions and switching from tutorial to tutorial),
Anyway, I made it.

This was 2 months ago ... then time passed, and today I got a message "no space left on device". Hm, weird. I check and oh damn, my SD card only had 5GB on it ...!!

It looks like I've loaded the *GB version partition scheme at some point ... or just wrongly formatted the partitions ... or I don't know.
I've tried to check using fdisk, but it doesn't help me much.

I also tried some tools like "Partition table" but I still can't find the missing 10GB. it seems like they're just unpartitioned, but not even recognised as it ...

Did anyone ever had this issue? Any process to fix it? Or at least any way to rollback to the original partition scheme.

Many thanks!
Best,

**** it seems like the post subscription didn't work, I've just seen your replies.

Thanks guys, it seems like the right way to do it.
I'll try to do it tonight and let you know the progress.

Cheers!