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Can I DIY upgrade to Gen 3 door handles?

Two of my Gen 2 door handles have partially failed.

Wondering if it's possible to DIY upgrade to Gen 3. Has anyone done this?

Can I replace it, drive to a SC, enter service mode and stage a fw update? Or would I need Toolbox for something like this? I've heard there may also be some calibration involved with the handle? This true?

I actually don't even mind paying/trying Toolbox for this if instructions are clear.

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