Looking at the DiskStation DS414slim, I discovered that DSM was now available in version 5. But it wasn’t available from the DSM 4.2 control panel on my DS409slim. After a few Internet diggings, I learned that it should be possible to install DSM5 on a DS409slim. The main trick is to fake another DS. Looking at CPUs in Synology’s NAS, you can see that DS409slim and DS411j share the same Marvell Kirkwood mv6281 CPU and 16-bit@DDR2 architecture. That’s the trick to be able to use DSM5 on DS409slim.
First thing to do is to backup your data. You will not hold me responsible or liable for any loss or damage of any sort (…) ;-)
Now, connect to the DSM Web interface and update the DS409slim. The latest available version was DSM 4.2-3251.
Enable SSH daemon and connect to the Synology DS409slim using SSH. Check the system informations:
ds409slim> uname -a Linux ds409slim 126.96.36.199 #3251 Tue Aug 19 12:33:00 CST 2014 armv5tel GNU/Linux synology_88f6281_409slim
/etc.defaults/synoinfo.conf file and replace
Go back to the DSM Web interface and browse to “Control Panel – DSM Update”. After a while, you’ll see that “DSM 4.3-3827 is available for download”. Click the “Download”, then the “Update Now” buttons.
Wait while upgrade proceeds and NAS reboots. When done, log in to the Web GUI and browse to “Control Panel – DSM Update”. You will notice that the “Model name” is now “DS411j” and that “DSM 5.0-4493 is available for download”. As before, download and apply the upgrade.
The upgrade process will proceed and the NAS will reboot. In my case, it lasted less than 5 minutes.
Once again, log into the Web GUI and browse to “Control Panel – DSM Update”. You’ll have to run the DSM5 wizard before being able to log into the admin pages.
In my case, I was notified that “DSM 5.0-4493 update 4 is available for download”. So I went for the upgrade and another reboot cycle.
Last thing to do is to update the installed packages. This is done through the Web GUI. Browse to “Package Center – Update” and click “Update All”. This process did last for quite a while here ; about 10-15 minutes. But everything is automatic so you don’t have to stand in front of the Web browser while processing to updates.
From here, the DS409slim is ready to use. A forum post I found notified that another trick has to be used to enable e-SATA connectivity ; as DS411j doesn’t have such port. I don’t use e-SATA so I didn’t check if it is working or not ; let me know ;-) Anyway, you have to log in using SSH and edit the
/etc.defaults/synoinfo.conf file. Check that
While you’re in console, have a look at the system information and compare with the initial value:
ds409slim> uname -a Linux ds409slim 188.8.131.52 #4493 Thu Aug 21 21:43:08 CST 2014 armv5tel GNU/Linux synology_88f6281_411j
Reboot to apply the e-SATA tweak and that’s all for it. Now enjoy you’re DS409slim with DSM5.0!