I have followed the steps you have on the wiki.
Is it possible to recover it somehow and I give it up for lost? : SIf TestDisk is not yet installed, it can be downloaded from TestDisk Download. Extract the files from the archive including the sub-directories.
To recover a lost partition or repair the filesystem from a hard disk, USB key, Smart Card, etc., you need enough rights to access a physical device.
Dos.png Under DOS, run TestDisk.exe
Win.png Under Windows, start TestDisk (ie testdisk-6.13/testdisk_win.exe) from an account in the Administrator group. Under Vista, right-click testdisk_win.exe and then "Run as administrator" to launch TestDisk.
Linux.png Under Unix/Linux/BSD, you need to be root to run TestDisk (ie. sudo testdisk-6.13/testdisk_static)
Macosx.png Under MacOSX, if you are not root, TestDisk (ie testdisk-6.13/testdisk) will restart itself using sudo after confirmation on your part.
Os2.png Under OS/2, TestDisk doesn't handle a physical device, only a disk image. Sorry.
To recover partition from a media image or repair a filesystem image, run
testdisk image.dd to work from a raw disk image
testdisk image.E01 to recover files from an Encase EWF image
testdisk 'image.???' if the Encase image is split into several files.
Linux.png Macosx.png To repair a filesystem not listed by TestDisk, run testdisk device, i.e.
testdisk /dev/mapper/truecrypt0 or testdisk /dev/loop0 to repair the NTFS or FAT32 boot sector files from a TrueCrypt partition. The same method works with filesystem encrypted with cryptsetup/dm-crypt/LUKS.
testdisk /dev/md0 to repair a filesystem on top of a Linux RAID device.