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Hello,

out of nowhere the RUT955 system was only in read only mode? It deleted from the flash all changes after each reboot.

Why does this happen and how can i prevent this?

dmesg shows this error:

"df -h" on the device shows also that it is only mounted to the "/tmp" RAM as fallback?

overlayfs:/tmp/root 61.5M 540.0K 61.0M 1% /

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Hi,

Are you able to reach bootloader menu? https://wiki.teltonika-networks.com/view/Bootloader_menu

Try to reflash your firmware to the latest one from there and see if this issue happens again.

If it does - it could be a flash storage hardware issue, in that case return the device to the reseller.

EB.
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I could reflash it without bootloader and then OverlayFS was normal again. But why does it happen? (We have multiple RUT955 devices in filed, and it would be bad when this happens again in field to some devices)

Firmware issue?
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This could happen because of incorrect firmware flashing or something going off in the process. So if you've flashed it now and it works - it shouldn't happen again.

EB.