A hard reset removes all information from your device and returns it to a state just like it has never been used before. All contacts, messages, emails, third-party applications, etc. will need to be reinstalled after performing a hard reset. To perform a hard reset, from the Home screen tap Menu > Settings > Privacy > Factory data reset. Follow the on-screen prompts to complete. This process will take 5–10 minutes
This method only resets it to the latest firmware currently on your phone. If you have 2.2, it will restore it to 2.2. You can't have 1.5, because the Evo shipped with 2.1 update 1.
My Evo got the OTA upgrade last night, and now my settings lack a "Privacy" section. How do I factory rest the phone now?
I installed the bootleg Flash 10.1 on Eclair, and now I find it conflicts with the factory installed Flash on Froyo to the extent of causing the browser to crash frequently. Consensus on the forums is that a factory reset is required to fix this.
I just updated my evo to froyo and I have the same problem with my browser crashing whenever flash content is viewed. I too installed the beta hack of flash 10.1 on eclair.
So how did you fix this?
I did a factory reset. It was a bit painful, but it was the only solution I found on the boards that offered a permanent fix. I didn't try it, but it was reported that reloading the Flash hack package would fix things until your next restart. I wanted the change to stick however, and I also wanted Froyo's standard code. You might try searching android forums to see if there's not another fix out there. It may just be a couple of files with incompatible configuration info, or it could be more extensive than that.