Nexus 4 4.2.2 OTA Enable LTE

Living in Canada and as a fan of Nexus line, I can't resist to not buying Nexus 4.  Upgrading from Galaxy Nexus, I can tell the new Nexus 4 is really nice phone.  For less than $400 CAN, you get a quad-CPU, 2G RAM, 16G storage, and most of all..LTE connection from Fido.

Before I update to 4.2.2, LTE works great with the new Fido LTE sim card.  As a 6G data plan user, this is a great function.  However after I update to 4.2.2, LTE no longer work for me and the *#*#4636#*#* tick no long hold the LTE option.  OK, ask myself do I really need LTE?  Tried the phone few day without LTE and I can tell, Yes, I do really want LTE and now I need to bring back the LTE.  Did some research and ended up this function is broken by BaseBand from 4.2.2.  As a Nexus phone (Dev phone), we can flash the phone to use a different BaseBand.  Here is what I did to enable LTE again on 4.2.2 Nexus 4.  NOTE: I just record the step for myself and I'm not sure what will happen if you follow the steps.

DO IT AT YOUR OWN RISK!!

Step 1:
Install Android SDK and all latest update on your PC.  The key point of installing Android SDK is to get the fastboot.

Step 2:
Connect your phone to your PC via USB cable.  Make sure you install the driver.  (If you need the driver, you can point it to "C:\Program Files (x86)\Android\android-sdk\extras\google" assume you install your SDK under "C:\Program Files (x86)").

Step 3:
Now we need to flash the radio.  I flashed my with .33 from 4.2.1 and I got it from 4.2.1 image.  (I put the radio file in a zip file and publish it here)

Step 4:
When you phone is connected, reboot it to fastboot mode.  To do it, turn off your phone and turn it on by holding volume down and power button.

Step 5:
NOTE: This step will reset your phone and all settings/apps will be gone.  Back up your data before you do it.
Now your phone is in fastboot mode and it is connected to your PC, we can use the command prompt to flash the radio.

From CMD, type:
fastboot devices (If it is connected, you will see your device ID)
fastboot oem unlock (If it works, you will see a message "OKAY")
fastboot flash radio [Name of the radio img file].img (If it works, you will see more "OKAY" messages)
fastboot reboot (Now we are done we reboot the phone)

Once it is flashed, you need to go through all configuration just like you got it from the box.  After that, the 4636 tick for LTE will work again.

I have that enabled for few days and I don't have any issue with the WIFI, Connectivity with Fido (on 4G), and battery itself seems no impact at all.  Hope it helps.