Originally Posted by Swetnes
NOW YOU CAN INSTALL CWM DIRECTLY FROM ICS
INSTALL AN UNLOCKED BOOTLOADER WITHOUT UNBRICKING
A few months ago I found this thread on XDA :http://forum.xda-developers.com/showpost.php?p=42657066
This thread provided a way to install CWM from Jellybean V30C for the SU640 without unbricking the phone first. Now not exactly the same, the phones are close enough that it peaked my interest. Digging into it I discovered that the partition mmcblk0p7 contains the bootloader, and it was as simple as pushing the unlocked bootloader from Gingerbread to the correct partition, therefore bypassing the entire need to unbrick the phone first and thus allowing the install of CWM.
So I got brave enough and installed the P936 v10i Gingerbread ROM and used the command in ADB shell to extract the bootloader:
dd if=/dev/block/mmcblk0p7 of=/sdcard/bootloader.img. After this I restored my phone completely to stock. Rooted using the root at the above link, then ran my batch file and I had CWM no Security Error!!
The steps are simple:
Start with stock ICS (any version, carrier or phone version p93x). v20c, v20d, v20e, or v20f.
1. ROOT PHONE with the root from the above link or any method that works for you.
2. Run my batch file.
3. Install a custom ROM.
Before anyone asks me I used v 126.96.36.199 TOUCH for CWM. There are actually several reasons why. For me v 188.8.131.52 was incompatible with any ROM with kernel version 3.4. Also if I would initiate a backup from the Rom Manager app, CWM couldn't locate the backup directory.
First this only is recommended for LG's Nitro HD models P930, P935 & P936. I do not recommend installing on the SU640 or LU6200.