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Recover data after upgrade from version 25 to version 28

I had the Fedora 25 on a Dell machine (dual boot). Recently I did an upgrade to Fedora 28. The old version held the most important data part:/OldDATA/mydata under the partition (/dev/sda8/). With the new version, the system automatically created /DATA, then placed the OldDATA under new /DATA, and mydata folder was seemingly erased, it disappeared. I used testdisk to fix the problem, but unfortunately, it does not work

What could you suggest me to recover the "mydata"?

$ls /DATA/OldDATA it gives me an empty folder, mydata are not here neither elsewhere

$ ls /DATA/

1 bin boot DATA dev etc home lib lib64 media mnt null opt proc root run sbin srv sys tmp usr var

$ ls /

1 bin boot DATA dev etc home lib lib64 lost+found media mnt null opt proc root run sbin srv sys tmp usr var

$ fdisk -l

$ Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors $ Units: sectors of 1 * 512 = 512 bytes $ Sector size (logical/physical): 512 bytes / 4096 bytes $ I/O size (minimum/optimal): 4096 bytes / 4096 bytes $ Disklabel type: gpt $ Device Start End Sectors Size Type $ /dev/sda1 2048 1050623 1048576 512M EFI System $ /dev/sda2 1050624 1083391 32768 16M Microsoft reserved $ /dev/sda3 1083392 200369095 199285704 95G Microsoft basic data $ /dev/sda4 200370176 202121215 1751040 855M Windows recovery environment $ /dev/sda5 202121216 221650943 19529728 9.3G EFI System $ /dev/sda6 221650944 260712447 39061504 18.6G Linux filesystem $ /dev/sda7 260712448 604506111 343793664 164G Linux LVM $ /dev/sda8 974176256 1953523711 979347456 467G Linux filesystem

Disk /dev/mapper/fedora_bachmachine-root: 74.5 GiB, 79997960192 bytes, 156246016 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mapper/fedora_bachmachine-swap: 7.5 GiB, 8002732032 bytes, 15630336 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mapper/fedora_bachmachine-var: 28 GiB, 30001856512 bytes, 58597376 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mapper/fedora_bachmachine-home: 54 GiB, 58003030016 bytes, 113287168 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/sdb: 1.8 TiB, 2000398933504 bytes, 3907029167 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 33553920 bytes Disklabel type: dos Disk identifier: 0xf6d02017

Device Boot Start End Sectors Size Id Type /dev/sdb1 2048 3907024895 3907022848 1.8T 7 HPFS/NTFS/exFAT