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[How-to] How to Update CyanogenMod 7
I've been getting a lot of questions on YouTube regarding how to update CyanogenMod 7 on the Nook Color. Instead of creating a version specifically for that device, I created a general tutorial that can be followed by anyone with a CM7 supported device.
For your convenience, I've embedded my YouTube video which demonstrates how to do this. If you learn better by seeing the steps in action, I'd recommend that you view the video first, then read this afterward.
1) Your device must be rooted and already running Cyanogenmod 7.
Step 1- Download the updated CM7 ROM for your device.
Click here > Select your device from the list > Click "Stable Mod" > Select the latest version of CM7. The latest version will always appear at the top of the list.
[NOTE]You don't need to download the Google Apps pack or be concerned about losing any of your apps. They will not be affected.[/NOTE]
Step 2- Download & install Dropbox on your computer.
[NOTE]We'll be using Dropbox to transfer the updated ROM from our computer to the device. (You don't necessarily have to use Dropbox. You can use a USB cable to transfer the ROM to the SD card or you could just download the ROM directly from the browser. This is just how I do it.)[/NOTE]
Step 3- Transfer the updated CM7 ROM from your downloads folder to Dropbox.
Step 4- Open ROM Manager on your device > Tap on Flash ClockworkMod Recovery > Select/ confirm your device model > Allow the Superuser request. After a few moments, you should see that it has successfully flashed ClockworkMod Recovery. Tap OK.
Step 5- Download Dropbox to your device.
Step 6- Open Dropbox. Locate and tap on the updated CM7 ROM. Once you tap on it, it'll start downloading onto your device.
Step 7- When the file finishes downloading, ROM Manager will automatically open with a window titled "ROM Pre-installation". Inside of this window are (generally) two options: Backup Existing ROM and Wipe Data and Cache. Select Backup Existing ROM > OK. You can also select Wipe Dalvik Cache if it shows up for you. If it doesn't, it's no big deal.
[WARN]Do not select Wipe Data and Cache, as this basically acts as a factory reset. You will lose all your data if you select this. You'll also have to reinstall the Google Apps pack.[/WARN]
[NOTE]If ROM Manager did not appear after the file finished downloading, manually open ROM Manager > Install ROM from SD Card, then locate and tap on the updated ROM file.[/NOTE]
Your device will now reboot into ClockworkMod Recovery. Right away, it will create a backup of your device. After that, it will install the new version of CyanogenMod 7. Once those tasks have finished, you're phone will reboot with the newest version of CyanogenMod 7.
If you're unhappy with the new version of CyanogenMod 7, you can always roll back to whatever you were running before. That's why I had you backup the device before the update. To restore your device to the way it was before we did anything, press and hold the power button > Reboot > Recovery. Your device will now boot into CWR. Once it boots, scroll down to Backup and Restore > Restore and then select the backup on the bottom of the list. Once it's done, select reboot system now. Now your device will reboot with the older version of CM7. It'll be like nothing ever happened.
There's a much easier and less involved way to updating CM7 through the Premium version of ROM Manager. It's around $6 in the Market, but it allows you to check for updates, download the new version of CM7, and everything else I described above directly in the app. No transferring of files from computer to device. Generally, people don't want to spend that much money on an app, so that's why I didn't cover it right away.
Hope this helped!