I've been wanting to upgrade my Turnigy 9X stock firmware to er9x for a while. Most of the tutorials I've watched are overwhelming. The SmartieParts board makes this upgrade dead simple and solderless if you have a Generation 2 Turnigy 9X. This video talks you through the process of determining your 9X Generation.
Generation 2 users will have an easier time doing the upgrade, but it's not impossible with Gen 1. You just need to do a little bit of soldering. My SmartieParts board will be here this week and I'll walk you through the process of upgrade and firmware flash.
Here are more details from the SmartieParts site about what is necessary if you have a Generation 1 Turnigy 9X transmitter:
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