yep that is all you would have to do. just flash a gingerbread rom and you will be updated as far as software goes. i would however, recommend something better then the stock gingerbread 4.53 rom. try out mikg 2.5. it is a stock rom that has elements of sense 2.1 and sense 3.0 which our evos will never get. it is very fast and stable. and all of these roms are found on the rom/kernel sticky.

if you want to update your radios as well then that is up to you. it is not necessary to update them. however, some people have reported that they get better signal and thus better battery life. for me i updated my radios with the 4.24 ota and i have not seen a difference in signal strength or battery life. i do plan to update to the most recent radios this weekend, however.

but please read this:http://androidforums.com/evo-4g-all...before-you-flash-your-radios-read-thread.html. do not let the warnings scare you. many here including me, have flashed radios with no issues. just be aware of what you are getting into when flashing radios.

 

Welcome to the forums!!!!!!!!!!!!!!!!

I too would suggest using MikG. Great combo of sense2.1/3.0 and good on battery life

 

If you want to overclock, I would suggest trying either ChopSuey Universal kernel or lithid's freedom universal kernel