Understanding the parts of the software

A) Recovery image – Its a small program which starts when you press home+power while the phone is turned off. From this image you will be able to upgrade to new roms, make important nandroid backup, reach a recovery console, check your sd card etc. Normally you don’t change this software often and its not included when you download new releases from internet for installation. Update: The latest recovery image, cyanogen 1.3, has automatic nandroid restore, making it very easy for complete restore directly from the phone. No need to restore from spl any longer.

B) spl – its the second program loader. Its a small program which starts when you press back+power while the phone is turned off. From this image you will be able to restore your phone completely from a nandroid backup using fastboot. I am not so sure what more it does but the newest version is required to run most roms. Normally you don’t change this software often and its not included when you download new releases from internet for installation. Update: The latest recovery image, cyanogen 1.3, has automatic nandroid restore, making it very easy for complete restore directly from the phone. Nio need to restore from the spl any longer.

C) Radio image – Its the software which handles the phones radio communication (gprs, 3g, wifi etc). This software has so far only been released by google or HTC and its vere recommendable to update to the latest version.

D) The Android ROM – This is the part which holds the android OS and which you probably will change often. New releases are coming all the time.


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