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thanks very much for your help! Actually this method worked for me: WARNING: you'll loose your configuration and installed apps! create the syno pendrive from scratch (it's corrupted during upgrade) create an ubuntu live pendrive boot up linux and open terminal sudo -i apt-get install mdadm lvm2 mdadm -Asf && vgchange -ay fdisk -l | grep /dev/sd mdadm -AU byteorder /dev/md0 /dev/sda1 /dev/sdb1 (and list all your first partitions of the disks) mkfs.ext4 /dev/md0 now all your 1st partitions are formatted, reboot removing ubuntu pendrive and inserting syno pen choose reinstall use manual install and select last working PAT wait....., and you'll be DONE (of course all apps and configs are lost, but data should be there)

Solved it Enabled SSH in the control panel Connect via SSH using putty edited both etc/synoinfo.conf and etc.defaults/synoinfo.conf with the following in vi: maxdisks=22 esataportcfg=0x0 usbportcfg=0x‭7FC00000‬ internalportcfg=‭0x3FFFFF‬ rebooted, and all disks appear fine Might be handy for anyone else having this issue. Cheers,