HDMU_15171_E2_spark_217_git_4171_nodebug_mix_Flash .zip

Is broken as well. It boots up and allows a first configuration, but then the Menu script which is being called when you hit the Menu key leads to a crash and reboot.

The last three available Spark builds therefore are broken and should be removed. They lead to unneccessary work when trying to flash them, with hours needed to clean up the mess again. Very frustrating experience.

Screenshot:
(click to enlarge)