To flash these radios, you must already have HSPL installed! Click here to find out how!
You only need to pick the radio you want, and flash it. That is all that is required.
I have been able to successfully extract the original shipping radio, and the radio update for Mango (v1) to files that can be flashed to the Spark_W (Verizon Trophy CDMA) without flashing an entire rom. This is really nifty for when you downgrade your SPL to 1.03 using the method described in my downgrade thread, and you are forced to use the shipping radio. Now you have the option to flash a newer radio (and for myself, the v1 Mango radio works much better than the shipping NoDo radio).
To check what radio you currently have installed on your phone, you can either enter the bootloader by shutting down your phone, then pressing vol-down + power when starting the phone, or by navigating to Settings=> About Phone=> More info.
In my own personal testing, I did not get any factory reset by flashing these radio files. If your phone factory resets flashing these radios, navigate to Settings=> About Phone=> More info and post what hardware version you are using. All testing on my own phone was done on hardware revision 003.
The flashing software included with these radio's is a newer version that doesn't ask a bunch of questions! Once you have put your phone into bootloader mode, run the ROMUpdateUtility.exe and it will automatically start flashing the radio to your phone!
Spark_W Radio list (last updated 04-01-2012)
1.52.00.03.28_23.15w.05.06U Original shipping radio with NoDo. If you used the SPL downgrade method, you will probably have this radio. 1.53.00.08.02_23.16w.05.06U First Mango shipping Radio. (Mango v1 Radio) 1.53.00.12.01_23.17w.05.13U Second Mango shipping Radio. (Mango v2 Radio) 1.53.00.02.15_23.17w.05.13U Third Mango shipping Radio from official 8107 rom. (Mango v3 Radio)
I hope for those of us already testing custom HSPL roms on Spark_W that this will be a huge help. I personally get much better reception all around with the later radio (at least in CDMA). Please feel free to comment on CDMA/GSM reception of each radio, etc!
I am surprised no one has created a thread like this for Spark GSM radios. The method of extraction is simple. (Use OsBuilder to extract rom image. In settings put SPAW1000 ID and check radio.nb and uncheck os.nb. Build rom.. on other phones you'd replace the ID with whatever is required).
Now, get testing these radio's out and give feedback!
*edit* I'm not sure if Mango v2's drivers included a radio update. I will have to flash back to stock and confirm sometime this week, unless someone running and up-to-date stock rom can tell me?
*edit 2* [04-01-2012] It's not joke, I added Mango v2 radio. Best radio I have used so far.
*edit 3* [04-14-2012] Added Mango v3 radio from 8107 official Verizon rom (RUU_Spark_W_S_VERIZON_WWE_2.04.605.02_Radio_NV_02 15_NV58008_RELEASE.exe available in football's rom thread). Yes, I know the version number is lower and it isn't a typo this time! That is the reported version! It's also notable that this radio is larger in size then previous versions!