Thats right. I always update the bootloader from the nas it self. Its easy as: - wget https://download.xpenology.fr/XPEnology ... 5644.1.img - find you usbdrive with fdisk -l - dd if=XPEnoboot_DS3615xs_5.2-5644.1.img of=/dev/sdg1 - Then update DSM on your NAS, and reboot - Enjoy