My understanding is:
1.1 US
1.2 UK
1.3 France
1.4 Germany
I believe the only difference between these firmwares are date format and regional language. If you moved from 1.4 to either 1.1 or 1.2, you should not lose any functionality. If it is possible, perform a dump of the existing firmware in case you needed to revert back to the original firmware.
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