Why are you using a "German" update image on an International/USA (90D4) device?
https://wiki.mobileread.com/wiki/Kindle_Serial_Numbers
Using a current KindleTool taken from NiLuJe's current snapshot thread, on a terminal on the PC, do:
kindletool.exe convert --info <... package_name.bin ...>, capture and post the result (quoted as "code").