my gt540 is only rooted i changed nothing expect rooting it with z4root.apk. i m new to phone updating. n i want to be safe. would it be enough if i follow only "install via recovery" steps.... ie: "How to install via recovery: 1. Download the recovery update from here 2. Copy the update to your SD Card (I recommend on the root of the SD Card (not in any folders) 3. Boot into recovery by holding the Home button on power up, or when rebooting the phone, select 'recovery' in the options list. 4. Make a backup of your current version just in case. 5. Navigate to 'apply zip from sdcard'>'choose zip from sdcard' then select the update-cm-7.0.0-GT540-MUR4IK-signed.zip file and flash it. 6. Enjoy! " or i have to follow every thing on the 1st page.