Morpheus1700

hello, I did an upgrade to 6.2.1 on my ds3615xs and now it doesn't work. (a mistake, I didn't see the warning) I tried to go back to 6.2 but it doesn't work, it tried to repair the system and nothing is happening I tried the loader 1.04 with 918 image, doesn't work either how can I repair my xpenology without lost of my data. thanks in advance for your help my config : HP micoserver Gen 8 1610T