Today, i have tried it again with TestDisk with following your advice.
Changed second partition (it was showing highest amount of data relative to other partitions) to "p" then rebooted computer. And it worked Not a single data was lost.
I have 3 hard disks. 1st one is 250gb Samsung SSD, has win10 in it. 2nd one is 250gb Toshiba portable that works slow and has connection problems, 3rd one is 500gb Seagate, which is from my brother's work computer that he gave it to me few days ago. All is/was NTFS.