I am sorry for writing in English.
I have the ame issue, I foud out that when I press the Volume- button while it starts AND it is connected via USB to the PC, it goes into the boot menu but then I need fastboot and I have to enter in the cmd promt: fastboot continue.
Then the phone boots, but I have to do it every time my phone switches off. So I still need a good rescue.img. With the dload it does not help since I have to enter again fastboot continue and then it skipt the updatig process. Do I need to enter something else in adb or fastboot?