[How-To] - Untethered Jailbreak iOS 6.1 iPhone 5 using evasi0n

Here's a great video from iDB which showed step-by-step to Jailbreak using the latest Jailbreak tool - evasi0n .

[How-To] - "No Connection - Couldn't' connect to the server"

This happened when I restore the apps with data after a ROM upgrade.
The way to fix it is by either restoring the app WITHOUT the data or do a fresh install from the Play Store.

ROM Manager error - The features is only available to Premium users!

I purchased the ROM Manager Premium and after flashing the new CM 10.1, I am unable to download new ROM updates. I the app kept asking - "the feature is only available to Premium users".
Finally I found the solution by in uninstall and reinstall back the Premium license.

[HOW-TO] - Solved! “This device isn’t eligible for the requested build” Error in iTunes When Updating iOS 6.1

Mac OS X:
Step 1. On your Mac, go to your “Applications” folder.
Step 2. Now navigate to the “Utilities” folder.
Step 3. Launch “Terminal”.
Step 4. Type “sudo nano /etc/hosts” (without quotes) and hit return.
Step 5. Enter your password
Step 6. Use the down arrow key to find the “gs.apple.com” entries. Once the cursor is in front, make sure you comment out the line(s) by entering “#” in front of the text.
Step 7. Save the file by pressing CONTROL+O.
Step 8. Exit the nano editor by pressing CONTROL+X.
Step 9. Restore your iDevice.

Windows:
Step 1. Start --> Programs --> Accessories
Step 2. Run Notepad or WordPad 

Step 3. Click “Open..” from File menu.
Step 4. Browse to Windows/System32/drivers/etc 

Step 5. In “files of type:” select all documents
Step 6. Open “hosts”
Step 7. Delete all line that has “gs.apple.com” or something like that 

Step 8. Hit Save
Step 9. Restore your device

My Nexus flashed with CyanogenMod 10.1 (CM 10.1)

Backup using Titanium Backup to ba k up all necessary files.
Using ROM Manager to download CM10.1 and later flash it.
Restore the necessary backup files using Titanium Backup app back.