Lumin D2 with Expert Pro CI

[Axel]

I changed the configuration by editing an existing file on the configurator website
(Mainly to reduce the sub voltage output from 1.8V to 1.0V)
Downloaded the file dp_cfg.txt
Copy this to the SD card
Amp says:  Config file bad

Looking at the file with Notepad, it used to be a text file.  Now it is this (below).  Tried to upload the file, then see "An error occured while reading the configuration file"

Have tried 8 times now.  Any idea what is going on?

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Yes, as @Delija says. The file starts with a CRC. No one has figured out which CRC Devialet uses so protected config files can't be edited outside of Configurator.

The CRC is generated by the lines of code within the file, not Devialet using a specific code. See here for full explanation:
https://en.wikipedia.org/wiki/Cyclic_redundancy_check