Thre are a few ways to do this but some your system may not currently support depending on what version of software is on it.
As DM tend to evolve their software over time, new features and methods of upgrading are brought in.
So, do you happen to know what version of software you currently have installed?
From a telnet prompt, or serial connection at 115200 8N1, type version.
To fix the unit, there will be several zip files on your USB stick.
These are prefaced with the location of the drive on which they need to be installed.
So if a file is called NVD0xxxxx.zip then it needs to be extracted to NVD0.
If the file is prefixed with UPGRADE then it goes on to what is currently configured as the system drive.
This is either the main drive drive, or in some gen3 products, it can be a built in memory drive.
You can tell which by doing via telnet/serial: Escm\enquire\appdrive
Actually press Esc key where I've typed Esc.
This will likely return mdd0 or hdd0
So you would extract the NVD0 zip to NVD0 like this:
unzip NVD0xxxx.zip /nvd0
The UPGRADE files to the correct drive, for my example mdd0:
unzip UPGRADE*.zip /mdd0
* is the wildcard, same as windows so will take all files with the UPGRADE prefix.
If you want to go hunting for why the software upgrade hasn't already worked then poke around in the /hdd0/bin or /mdd0/bin directory and check that you have all the application and codec files present.
For the M3G SD32 there should be a m3gp.elf and c2dm.elf in this folder.
Getting au fait with the DM streaming out of the serial 1 port is good if you have a lot of systems installed or are an installer.
If things go wrong, normally there is a key point in there to show what has happened.
DM have integrated this on to their webpages too for customers to review without the need for serial comms.
