DISCLAIMER! I’ll take no responsibility for any loss of data or any other problem caused by following this tutorial.   Reinstall DSM (eg 5.2-5644) without losing the data on Volume:   01. Enable SSH if it`s not & connect to SYNOLOGY 02. Open & edit the file \etc.defaults\VERSION 03. Exchange the data with one of previous ver.: majorversion="5" minorversion="2" buildphase="0" buildnumber="5592" builddate="2012/12/05" 04. Save & Exit 05. Restart Synology 06. Launch Synol