Need firmware Grundig Mpaxx 900 series
 

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Info:
GRUNDIG MPaxx USB Device

PnP Device ID: VID = 10D6 PID = 1101
Serial Number: 4512482ADF0FE
Revision: 2.00

Chip Vendor: Actions
Chip Part-Number: ATJ211x

You have an Actions Chipset (D-Wave 2GB MP4 Player / AK1025 MP3/MP4 Player) Try looking for that direction...