[Alkin]

I have semi dead mp4. I did what was recommended according the guide above and did install mp4 as ADFU device. But when im trying to install firmware the using MP3 Player Utility it gives me the massage “Device switching fail. Reconnect the device please!”. Done it several times, same result.
What should I do?

PS MP4 screen shows blue background with hourglass placed horizontally. Nothing else.