I tried to flash the firmware but it did not work:
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The device did not reboot into fastboot but in stock recovery. When I choose Reboot to fastboot in the recovery menu the process continues in the rominstaller:
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When I restart the device it boots up into fastbootmode. I do not know what the problem is. Are there alternatives that can help me to flash a ROM? I am open to all sugestions.
I am not entirely sure. When mine rebooted, it rebooted into the stock recovery as well, but it continued with the rest of the installation while it was in stock recovery. I think the partition not found errors is due to being manually rebooted into fastboot mode. The install should continue on it's own after it reboots without you having to do anything.
You may also need to update the adb drivers. I had recently installed the ADB, Fastboot and Drivers from the thread below while trying to get things to work, so that may help.
15 seconds ADB Installer v1.4.3 ADB, Fastboot and Drivers What is this? This is All-in-One installer for 3 most needed PC tools for Android. No need to download big SDK for 3 small things. I originaly made it for my Kurdish friend AnGrY DuDe in...