If you have the HK variant of the M8, there was no need to flash the adsp file. That file doesn't add any settings to the ROM - it flashes firmware for Non-HK variants so that audio will work properly. You need to read the release post for that ROM again. Included in the post are instructions for how to set up the HK Settings in build.prop. This is a GPE ROM so there won't be any HK Settings in the actual Android Settings.