which way do I go???

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http://androidforums.com – I need to root my wife's Inc 2 so she can use tethering, here is her build info, was wondering which way i should go, upgrade then downgrade, or just install the downgrade? android version: 2.3.3 htc sense version: 2.1 software number: 3.02.605.1 pri version 1.92_002 prl version 52826 eri version: 5 (General)