I wasn't able to open .mobi files after setting up a fake reginfo using the format recommended by OP. Hopefuly there is a /var/local/java/prefs/reginfo example that works fine for later models / firmware
here:
Quote:
givenName=Hacker
userId=amzn1.account.XXXXXXXX3AAA587YYYYYYYYYYYYY
deviceName=FakeReg
userName=Hacker
deviceEmailAddress=hacker@kindle.com
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After a reboot my kindle can see .mobi files again!