Once you have those steps out of the way, let’s install Android 2.2 Froyo on our HTC Evo 4G!
This Froyo is *experimental* only, everything works except the camera. So make sure to backup your current ROM using Nandroid!!!
How to Install Android 2.2 Froyo on Your HTC Evo 4G!
Unzip eri.zip into eri.xml.
First, let’s connect your HTC Evo 4G to your computer as a “Disk Drive”.
Then copy over these two files eri.xml and Avalaunch-EvolutionV5.zip to the root folder of your HTC Evo 4G’s SD card.
Now, put your HTC Evo 4G back into “Disk Drive”.
Open up a command prompt and go to your SDK Tools directory (such as C:\sdk\tools) and type “adb shell” to enter the shell of your Evo 4G.
Type “cp /sdcard/eri.xml /data/.”
Now, let power off your Evo 4G and get into the recovery menu to flash the new Froyo ROM zip file.
After powering off, press the Power Button while holding down the Volume Down button. (Then select “Recovery” and Power button.)
Optional Step – It is *HIGHLY* advisable to save your current ROM so you can switch back and forth between the Froyo and your current ROM. To do this, just go to “Backup/Restore” then select “Nand Backup” to backup your current ROM!
Next, we will “wipe”, then “Wipe data/factory reset” then hit Power button twice.
Next, will will select “Wipe Dalvik-cache” then hit Power button twice.
Okay, next we can hit “Return” and Power button to go back to main menu then select “Flash zip from sdcard”.
Then select “Avalaunch-EvolutionV5.zip” and Power button twice.
Your HTC Evo 4G should now be installing the new Froyo ROM, it will take about 3 minutes.
When it’s done, simply hit the Power button and reboot into Froyo!
If you see the Nexus One splash animation logo, you are booting into Froyo!
You should see a new welcome screen, congrats! You just installed Froyo ROM on your HTC Evo 4G!
And yes, huge thanks to everyone at XDA Developers who made it all happen.
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