YES, that did it!!!
Thank you for the link to the GIR Editor thread, Cnfhbr. I will do some more reading on that for possible future use.
I followed the procedure by Butters and indeed in one step got rid of both the Hertz splash screen and got the "Go Home" icon back!
Thanks to both of you guys for your help. I already start to feel quite at home here...
Edit:
For those interested, here's the backup_16.bin file:
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