I'm not sure my solution can help you or not.
I've got this message too but after I formated H10 by Windows.
First backup all files by window explorer.
Open iriver plus and go to > Option > Portable Device Initialization.
This function will delete all data, Please sure that you already backup all of your data from H10.
After initialize process finished, it will ask you to disconnect and connect it agian.
Steps below, I can't explain it clearly. May be you will not have the
same results as me. I hope it can rise you some ideas how it comes.
followed that instruction but after I disconnected it again and turned
on, expected that msg will disappear, IT's NOT! a bit freak out.
Ok claim down,
I tried to turn it off but I can't then I pushed its battery out and put it back and turned on, that msg showed up again.
Then I connected H10 to Iriver plus again and it upgrades firmware automatically.
At the end after I disconnected and turn on my H10 it works perfectly.
I'm not a native English so my language could make you confused, any questions you can contact me[email protected]