[Desire General] Wh000sher:
So being a total n00b and not being able to find a guide of how to update from a Custom ROM to a new version of a Custom ROM I thought I would make a guide to help others who maybe like me and don’t know what they are doing. Hopefully the pictures arn't too big, if they are let me know and I will resize them.

Thanks to rootSU, kotag82 and stankyou for thier help in teaching me how to update a ROM.

BACKUP

First thing I did was to create a backup using Titanium Backup Pro

Load up Titanium Backup

Press MENU on your phone and click batch

Then click ‘Run’ next to ‘Backup all user apps + system data’

And wait for this to finish.

Next I wanted to make sure my SMS’s were backed up and I know that SMS Backup & Restore works so I use that.

Preperations

Next I decided to download the new version of my ROM (which is: MildWild CM-2.9 Based on CyanogenMod7.2 RC1)

Once downloaded I copied the new ROM to my SD card.

Now I rebooted into HBOOT by holding down the Vol – key and the power button.

Once in HBOOT I used the volume keys to select Recovery and pressed the power button.

As you can see I have ClockworkMod Recovery v5.0.2.0 installed.

Before installing the new ROM you will want to take a backup of your old ROM incase anything goes wrong you can revert back to it.

Select 'backup and restore'

then 'backup'

Once backed up, click ‘Wipe cache partition’ and press the home button.

Then highlight ‘advanced’ and press the home button

Then Highlight ‘Wipe Dalvik Cache’ and press the home button again.

Installation

Once you have prepared your phone it is time to actually do the update.

On the recovery menu go to ‘install zip from sdcard’ and select the option.

Now locate where your new ROM zip is and select it.

Then reboot your phone from the main recovery menu.

Restoring

You will now want to restore your applications and all of their user data, things like settings and user information. Now we have to load up Titanium Backup again and press the menu button, then select ‘BATCH’ and then scroll down to "Restore missing apps with data". By default the "App+Data" will be checked.

Now you can either "Deselect All" and then manually add each app that you want to restore when you have completed your selections then hit the "Run the batch operation" button at the top or choose all and let your phone do it.

It will take some time for the BATCH to run and re install your entire user installed apps. After the batch has completed then you are ready to install just a few of the other GREEN coloured items from the main menu.

This time from the main application window select the top middle "Backup / Restore" button. Now BE CAREFUL here, I ONLY RESTORE the a few of the options and have never had any problems HOWEVER if you try to restore Accounts and Settings and some other green coloured items you can run in to trouble with FC's....you have been warned!

You will now need to REBOOT your device for the system items to take effect.

Hopefully now your device will be as it was before and you can install apps that are missing and continue to use your phone.

If you have any issues or suggestions of how to improve this guide then please comment and I will try to answer them or will edit and improve my guide.

Wh00sher