Reset MT6000

Hi everyone…or bought the Flint2 at the pre-sale.
Since this morning something very strange has happened, I can’t connect to either the wi-fi or the ethernet network.
The thing that amazes me the most is that I can’t even reset it… it doesn’t work. I tried 10 sec, 30 sec and even a minute.
Is there anyone who can help me???

I solved it using “debrick via Uboot” as recommended