Data recovery from HDD (accidental mistake)

Data recovery from HDD (accidental mistake)

I've unintentionally damaged my external 2TB HDD which is also my warehouse of all the data I have. It was done using this guide: http://www.plop.at/en/winusbinstall.html#s2 . There in the situation 2 I did something like:
fdisk /dev/sdc
p
7
a
1
p
w
Currently, the fdisk output of the device looks as follows:
Disk /dev/sdc: 2000.4 GB, 2000365289472 bytes 255 heads, 63 sectors/track, 243197 cylinders, total 3906963456 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0005f107

Device Boot Start End Blocks Id System /dev/sdc1 2048 3906963455 1953480704 7 HPFS/NTFS/exFAT
It's a WD MyPassport 2TB. Can someone please help to recover the data?
EDIT: So what happened is that apparently I changed the FS type flag or something. So now I can't access data since since OS (both Ubuntu 13.04 and Win7) doesn't recognize the file system of the device. That is the actual assumed problem behind it.