It seems there's a workaround for this problem for "legacy" Synology NAS
1. Shut down the NAS
2. Remove all the hard drives from the NAS
3. Find a spare hard drive that you will not mind wiping and insert it into the NAS
4. Use Synology Assistant to find the NAS and install the latest DSM onto this spare hard drive (use the latest DSM_file.pat from Synology)
5. When the DSM is fully running on this spare hard drive, shut down the NAS from the web management console.
6. Remove the spare drive and insert ALL your original drives.
7. Power up the NAS and wait patiently. If all goes well after about a minute you will hear a long beep and the NAS will come online.
8. Use Synology Assistant to find the NAS. It should now be visible with the status "migratable".
9. From Synology Assistant choose to install DSM to the NAS, use the same file you used in step 4 and specify the same name and IP address as it was before the crash.
10. Because the NAS is recognized as "migratable", the DSM installation will NOT wipe out the data on either the system partition nor the data partition.
11. After a few minutes, the installation will finish and you will be able to log in to your NAS with your original credentials.
That means, in your case where you're running a non upgraded 4.3 version that you can definitively pass on Trantor's Beta 8 version, and then use local upgrades to go until the latest version (update 5 I think) ... just by flashing your USB startup key with latest you'll obtain the "migratable" state and being able to "reinstall" DSM without loosing data
- Link to Trantor's (thanks again Trantor) DSM 4.3 Beta 8: viewtopic.php?f=2&t=1361&p=17406#p17406
- Tutorial to use DSM internal update to go to the latest DSM update version (tested myself, it's working great, thanks Stanza): viewtopic.php?f=15&t=2999&hilit=3827
Hope this helps you waspsoton taking the control back on your NAS...