Hey @Polanskiman, thanks for all your help on tutorials etc in this forum.
I have a N54L microserver and I had DSM 6.0.2 installed bare-metal and running with no problems. Today I tried upgrading to 6.1.3 using the procedure you provided, burning a new USB with the edited grub.cfg file, disabling C1E in bios etc. Did everything "by the book", and I was happy to see that the machine booted and I migrated the machine with the correct .pat file. DSM loaded with no problems and data was there so everything was OK.
Unfortunately when I tried to update DSM, either automatically to update 8 or manually using the pat files of the updates (tried update files 1, 3, 4) the machine would not recover from the required reboot. In fact even if I did not try to update and just asked the machine to reboot, it would just load the kernel and just stay there, not loading DSM. Synology assistant would not detect it nor I could find it on my network. If i chose the second option on grub (reinstall, the system would again ask to migrate, install DSM PAT file etc...
Anyone else faced this?
How to overcome this problem?
Thanks in advance,
Tepes4