[eeglug9999]

My experiences with the MTP to UMS conversion:

I have a Black T10 2GB shipped with 1.71 MTP. On one comp with XP SP2,
I didn't have to do anything - the T10 appeared as an MTP device and I
could drag and drop using explorer(NOT WMP!).

My other comp with XP SP1: the T10 did not appear or could not be
accessed at all (can't remember which). Updated to WMP11 and then the
T10 appears as MTP and I could drag and drop with explorer(again,
never actually used WMP11 - just had to install it).

I was pretty content but then noticed that I was having problems with
OGG files where occasionally the T10 would 'select' a track and not play
the very last second or so of that track consistently. If I reloaded the
track from my comp, it may or may not go away but there seemed to be
no guarantee of when the problem would re-occur with other files.

Sooo...this is where I decided to make the switch of firmware to UMS.
I think I read a post here saying that the update might cure my issue.

The actual update was trouble-free. I downloaded the updater from iriver's
site and ran through the steps as recommended, being sure to click the
MTP -> UMS button. When I disconnected the player's USB, there was only
one reboot (not multiple reboots as others report) and all was good.

The OGG playback problem is still there...damn! It cuts off a second off the
end of a track of its choosing. When I copy the file back to the computer,
all the data is still there, including the tiny bit at the end the T10 won't play.

I do have another minor (yet irritating) issue. As MTP I used to drag music folders
without worry, but under UMS my T10 consistently reverses the order of my
album subfolders. My folder structure is artist folder containing numbered album
subfolders which contain numbered OGG or MP3 song files. With MTP I had no
issues, but with UMS the T10 reverses my album subfolders (eg. "09 album title"
is listed above/before "08 album title").

I used to be able to grab the whole artist folder and drag it to the T10 but now I
have to manually grab each album in numerical order...

I may be switching back to MTP...the only reason to change was for the OGG playback
issue.