I have the same question and the same issue for days and I've been googling and have already gone through pretty much every forum sites... But, I could never find the answer on how to create a backup of your own phone's radio image. I could imagine the post is 3 years old and no one shared their knowledge.
I have a motorola spice xt-300 from mobilicity and I wanted to upgrade it to 2.2 or 2.3 from 2.1 eclair.... but there's absolutely no help out there or no on is willling to help
I managed to create a rom dump of my phone.... and it doesn't have something says radio.img I only got the following in the romdump folder:
no radio.img..... I'm sure there's either a tool like "Radio Trimmer" which is available for galaxy nexus phone only online or somehow extract or edit these above files and find the radio.img....
and then if luck enough someone will comeup with CMW for this phone and CM7.1 or 7.2
I did update my huawei phone to 2.3.7 android...which was not that hard...
and now I was thinking to update the radio by taking my motorola spice's radio and putting it on my huwaei phone.....But back to square one on how to extract the radio.img from your phone rom
I mean I could even donate also if someone could provide with these issues....
Please guys and those gurus...I know nothing is hard for you developers and gurus when it comes to the custom recovery rom etc....
Please guide this newbie or tell how much u charge for this little work?
And my apology for sounding irritated...