Monday, September 24, 2012

Downgrade Nexus S from 4.0 to 2.3

Android 4.1 might too heavy for Nexus S hardware, below is howto downgrade the rom to ver 2.3.

Please note that all data on the phone will erase....

1. Download the image from google site.

2. Extract the file....

$cd /tmp/

$ tar -zxvf soju-grk39f-factory-5ab09c98.tgz
soju-grk39f/
soju-grk39f/bootloader-crespo-i9020xxka3.img
soju-grk39f/flash-base.sh
soju-grk39f/image-soju-grk39f.zip
soju-grk39f/radio-crespo-i9020xxkf1.img
soju-grk39f/flash-all.sh

3. Switch off  the phone, holding the vol up & power button at the same time until you see the bootloader screen.

4. Assume you have android-sdk installed, if not please refer to http://developer.android.com/sdk/installing/index.html for installation.

$cd soju-grk39f

$ ./flash-all.sh 
sending 'bootloader' (1536 KB)...
OKAY [  0.226s]
writing 'bootloader'...
OKAY [  0.344s]
finished. total time: 0.570s
rebooting into bootloader...
OKAY [  0.001s]
finished. total time: 0.001s
sending 'radio' (12288 KB)...
OKAY [  1.803s]
writing 'radio'...
OKAY [  1.680s]
finished. total time: 3.483s
rebooting into bootloader...
OKAY [  0.001s]
finished. total time: 0.001s
archive does not contain 'boot.sig'
archive does not contain 'recovery.sig'
archive does not contain 'system.sig'
--------------------------------------------
Bootloader Version...: I9020XXKA3
Baseband Version.....: I9020XXKF1
Serial Number........: 363003C175D100EC
--------------------------------------------
checking product...
OKAY [  0.001s]
checking version-bootloader...
OKAY [  0.001s]
checking version-baseband...
OKAY [  0.001s]
sending 'boot' (2936 KB)...
OKAY [  0.417s]
writing 'boot'...
OKAY [  0.383s]
sending 'recovery' (3176 KB)...
OKAY [  0.459s]
writing 'recovery'...
OKAY [  0.411s]
sending 'system' (188235 KB)...
OKAY [ 27.062s]
writing 'system'...
OKAY [ 23.307s]
erasing 'userdata'...
OKAY [  0.203s]
formatting 'userdata' partition...
Erase successful, but not automatically formatting.
Can't determine partition type.
OKAY [  0.001s]
erasing 'cache'...
OKAY [  2.017s]
formatting 'cache' partition...
Erase successful, but not automatically formatting.
Can't determine partition type.
OKAY [  0.001s]
rebooting...

finished. total time: 54.268s



DONE....