This requires having DD03 and joey's recovery 2.1.3 flashed in. Your baseband will still be DD03 but you should see ECLAIR.DD10 under build after updating. The DD03 w/ joey's recovery 2.1.3 .tar is in that folder - yes, you can flash this with the update tool. In fact, you have to flash DD03 with that before doing ANYTHING ELSE if you haven't put 2.1 on your phone yet.
To flash DD10 in:
Download:
SPH-M900_MR2_DD03_REL-joeykrim-recovery-2.1.3.tar (
ONLY FLASH IF YOU DON'T HAVE 2.1 DD03 OR JOEY'S RECOVERY 2.1.3 ALREADY - USE SPRINT TOOL TO FLASH THIS ONLY, IF YOU DO IT WILL WIPE YOUR PHONE)
Android2.1-DD10-SDX-update.zip
system_update_dd10.tar (this does not come into play ANYWHERE except inside the .zip file itself, so don't do anything with it except have it present on your SD card with the .zip file)
Install:
Copy both files to your phone's SD card, boot into recovery (Volume Down + Call + End Call), go to Data Options, click "Clear dalvik cache", hit the back button, click on "Apply zip from SD", and apply Android2.1-DD10-SDX-update.zip. Do not try to use the Sprint Update Tool using only the .tar, it will not work and you will need to completely re-flash your phone from DD03.
It will take a little bit to boot back up because the dalvik cache has been cleared, so be patient.
Congratulations, you just updated to DD10.
Notes:
This update will not wipe your data. However, making a backup is recommended before applying the DD10 update.
You will have to re-apply the
joeykrim-SDX-a2.1-root-v5.zip, which is also available in the folder linked below.
The system_update_dd10.tar file should be around 127,017,984 Bytes, give or take.
Also, you will have to remove any stock apps again either via ADB, root explorer, or droid explorer while booted into recovery (recovery has root).
2.1 ONLY Mirror - full list of
Downloads Here. I will be adding other files when I get home from work (theme de-odex, themes, N1 launcher, standalone recovery 2.1.3 .tar).