initfs - on EMMC, actually - is corrupted
There are two choices: either you use rescueOS to edit the EMMC, until initfs is restored to not-corrupted state; or, you use rescueOS to copy all the data (music) from EMMC to your computer, then reflash the EMMC, then after you have ascertained that N900 works, you move all the music back.
The first choice is the one I would have taken, if I knew precisely where initfs is stored on EMMC. Though I would be curious, and cautious, about the question what caused the initfs to become corrupted.
The second choice probably guarantees full recovery from whatever ails the initfs currently.
[Edit]Quick reply...
That's why I take care to hold the device screen-down, battery-up when opening the back cover: the battery has recently taken to falling out with ridiculous ease. Fortunately, the back cover itself isn't going to fall out on a whim.
I also frequently (once a week?) have to force the device into shutdown due to frozen graphical interface (keyboard backlight, screen backlight, lock-unlock slider, LED light work, but the screen-display doesn't change at all). It's a hassle, and I would be glad to find the reason for these freezes in logs, if possible.[/Edit]
Best wishes.
_________________
Per aspera ad astra...