Well, There's clearly no doubt whatsoever as to what the Serial Number is now!
I'm really puzzled. Must have done hundreds of these Ford Radio Codes over the years, as would have the others who do them, and have never come across this situation.
The only thing I can come up with, in addition to what Elekie has already mentioned that the radio must be faulty and disconnecting the battery for 5 minutes, is the question of how you are entering the code.
7847
Press Button#1 - Seven times
Press Button#2 - Eight times
Press Button#3 - Four times
Press Button#4- Seven times
PressButton#5 - Once to actually enter the code into the radio
Please note that you only press Button#5 once to enter the code after all four numerals of the code ( 7847) have been entered. You don't press Button# 5 after every single numeral entry.
I don't have anything else to suggest, I'm afraid.
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