After manipulating dd if=/dev/synobot.img of=/dev/sdu the old system is gone. Is there any way to get my system back? At the moment, having synology, I have access to ssh and can replace this download file.
Your old system is gone. Recovery is impossible. That dd command overwrites an entire device with an image, including the "blank" space. You should have done a dd to save the current image before you overwrote it, but it sounds like you may have simply following a cookbook and didn't really know what this was doing.
Someone would have to be willing to do a dd of their image and share with you, and they may be reluctant to because it includes a file (named vpd) that defines the model and serial number. Now that ReadyCloud is dead (which relied on the serial number) and lack of other support from Netgear, maybe somebody would be willing. But your system would be a clone if theirs unless you get the vpd changed to be right for your unit. Previous moderators have helped other restore the vpd file, but I do not know if the current mods can or will.
Hi. I'm about to install DSM on my Readynas Ultra 6. Could you please advise how to backup my original image before overwriting it?
These are the commands that I will have to execute:
Now SSH into the NAS box and first of all unmount any USB devices: #sudo umount /dev/sdu First time you sudo it will ask for your password #sudo umount /dev/sdu1 Next copy the synobot img file from /tmp to /dev #sudo cp /tmp/synobot.img /dev Next permanently mount the img file in the ReadyNas flash #sudo dd if=/dev/synobot.img of=/dev/sdu
However, before doing so, I would feel much safer if I could backup an image of flash.
I'm assuming you're booting with some DSM media and that /dev/sdu is the ReadyNAS flash. If that's not the case, then you need to specify the environment under which you are executing these.
The dd command at the end writes a complete image to device sdu from the specified image file. To preserve the image before hand, you need to use dd in reverse. It would be something like this:
#sudo dd if=/dev/sdu of=/tmp/readynas.img
I'm not sure why your instructions are having you copy the image file from /tmp to /dev. If there is a compelling reason, then you may need to create the backup image in /dev and then copy to /tmp.
But I don't know if /tmp resides on the device from which you are booting or RAM, which is why I say something like. If it's in RAM, then you still lose it on re-boot. So after creating /tmp/readynas.img, reboot and make sure the file is still there. If it's not, you'll need to go back to your source for these instructions and ask where you can store the image.
