I already flahsed the fiasco several times. The flash is always successful.
Booting the device after the flash will stuck the device the second dot (same behaviour when I got the device).

When I tried to switch to R&D mode, the dots are running but the boot never finished (i waited more than 10 minutes).
Disabling the R&D mode (after it was enabled of course) will cause the device to get stucked even before the dots phase and I need to reflash the fiasco in order to preserve the old state (where I'm getting stucked on the second dot).