Could some of you please check what it says in this file:
/sys/devices/system/soc/soc0/build_id
I have flashed LeslieAnn's radio zip file three times today, and it still says VM670ZV4
(I know, I'm late to the party, I like to make an appearance

)
It's too late tonite for me to set up gpst, and I have a full day tomorrow (been
told we are getting up
early to clean the house, then I have to work till 9ish, god I hate early morning honey-do lists!!!) but I have time on wed to investigate more.
If this turns out to be a reliable place to get the baseband info from, I can change the code in IHO based ROMs to show the baseband version under Settings>>About phone. It currently is setup to check for gsm basebands, since cdma isn't officially supported. I'm just not sure if that file is written by the ROM, or it's value is grabbed from the modem. Only those that can double check with gpst will know for sure.
Note- the file exists on the stock donor phone, and it shows ZV9, so I'm hopeful this could work!