Read this. You can edit grub.cfg and flash edited image to the usb stick again or do this trick on the working xpen and reboot it after cfg will be edited: Admin@your_DS:~$ sudo -i Password: root@your_DS:~# mkdir -p /tmp/synoboot_part0 root@your_DS:~# cd /dev root@your_DS:/dev# mount -t vfat synoboot1 /tmp/synoboot_part0 root@your_DS:/dev# ls /tmp/synoboot_part0 bzImage EFI grub info.txt root@your_DS:/dev# cd /tmp/synoboot_part0/grub #edit drub.cfg with mc or nano root@your_DS:~# exit
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