I have finished Deeper Search but TestDisk still couldnt find the singled partition

From memory, due to the fact that native Windows format wouldnt let me format 1TB external hard drive as FAT32 I ended up using Fat32formater to force format it.
I have tried every option in TestDisk but still could not see my partition. However, after adding MBR in Disk Management I was able to see my partition under [None] Non partitioned partition --> Advanced. When I tried to undelete my files I could only see arbitrary filename(s).
Is there anything else I can try?
Thank you for your time.