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My Sansa Clip+ suddenly started having bad checksum errors during boot

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dpitch40:
I've had Rockbox installed on my Sansa Clip+ for well over a year, with no issues until now. When I boot it up, I briefly get a screen with the following:


--- Quote ---Loading firmware
Length: 8B178
Checksum: 36A5B79
Model name: cli+
Loading rockbox.sansa
Sum: 3703225
Bad checksum

[There seems to be more text afterward, cut off by the bottom of the screen]
--- End quote ---

None of these values appear to change with successive boots. It then tells me to plug it into USB, and when it does the screen says "Bootloader USB mode". I can then see the player's internal memory, though not the contents of the MicroSD card. I haven't done any messing around with Rockbox's innards recently; the only thing I did that seems like it could have triggered it is putting some .m4a files (non-DRM) onto the MicroSD card. The library seemed to re-initialize fine at first and the songs showed up in it, but now I'm getting these errors after rebooting. What can I do?

Mihail Zenkov:
Check disk for errors and reinstall rockbox.

dpitch40:
I was able to check the disk, one of the two options at a time, and everything seems to have gone well there from what Windows told me. But now I'm having trouble reinstalling Rockbox. When I do certain things with the player (like try to Autodetect it in the Rockbox Utility, or check the disk with both options selected), it reverts from being named "SANSA CLIPP" in my list of drives and letting me see the files in it to being shown as a generic "Removable drive" with no files visible. This lasts until I eject it (from the system tray I can still eject it as "SANSA CLIPP") and replug it into USB. I suspect that this would be very bad if it happened while installing Rockbox. What can I do? Does this mean my player's memory is corrupt?

saratoga:
If you boot into the Sandisk firmware, is the USB mode more reliable? 

dpitch40:
Not really. Autodetect no longer blanks it out from my list of drives, but still doesn't detect it. Trying to check the disk with both options still causes it to turn blank. Should I manually specify that it is a Sansa Clip+ and try the install?

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