You will need to jailbreak your PW. That old a version of firmware might be able to be jailbroken with tools that, unlike WinterBreak, do not need a registered Kindle. You could try the LanguageBreak jailbreak.
I am curious to what you mean that Amazon blocked you from registering your PW1? Was it previously registered and has somehow become blacklisted (lost, stolen, lost in delivery)?
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