The Dangers of Upgrading

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http://www.mobileread.com – I am thinking about picking up a cheap EE 9.7"/10.1" model, with the idea of upgrading it to Ermine. I am a bit concerned about the potential for the white screen of death, however Ive also heard that its mostly limited to the PE model. Anyone know if thats true? How much of a gamble is it to upgrade the EE? (HowTos)