thank you for your quick reply, but I tried every bootloader from everybody with and without extra.lzma(1.01, 1.02, 1.03), but still nothing. I cant find the device with synology assistant, or with find.synology.com. I dont need 6.2, I only wish for 6.0.x, or 6.1.x. I changed the grub, tried without changing the grub, tried different usb-s for boot, before every try I formatted the HDD that I am using as the only connected HDD on the mobo. I can boot and run easy 5.2-5967(the latest), but cant get working any higher. I dont have a nullmodem cable, so I cant connect to the mobo any other way. I am using 3615