Booting stucket at 99%

[kairs]

My ReadyNAS is stucked at 99% at boot time, if I press the button on the front I can see that it is trying to run/load fvdropbox.service ....

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I have tried telnet: 

>telnet 192.168.137.154
Connecting To 192.168.137.154...Could not open connection to the host, on port 23: Connect failed

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I have tried to connect wuth RAIDar but and the status says:

Firmware: 6.5.0

- Management service is offline 

If I try to download the logs it stops at 0% and shows an error.

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I have tried the reset button:

When I press the reset button and the backup button the only boot option I get is "Normal" 

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I have also tried to create a USB boot stick, with ReadyNAS OS 6 (Marvell), ReadyNAS OS 6 (Annapurna) and ReadyNAS OS 6 (x86), but all fails during boot showing boot error on the lcd screen.

Is there any hope for this NAS?!

[mdgm-ntgr]

To use the boot menu you'd press and hold the reset button, turn the NAS on, keep on holding the reset button till you get a boot menu message. Then release the reset button and use the backup button to scroll through the different boot menu options.

[kairs]

I did not understand that I needed to release the reset button, before selecting the bootoption with the backup button.

Now I could select reinstall OS.

RAIDar shows: System starting up...

But it now seems to be stucked at booting and the LCD display shows "upnphttpd.service ..."

The admin password has been changed to default, so I guess the OS was installed.