I believe (but could be wrong about this) that the Radio code (the bit that controls network access (GSM/CDMA and wireless etc)) is separate from the Android core and enhancements so installing ROMS should be fine.
Certainly the MoDaCo ROM that I have installed on my GSM Hero cam without the Radio update and I had to flash that separately.
You should confirm this with a ROM developer though before you flash.
thanks that is pretty much what I thought I also was wondering is anyone knew is the CDMA Hero is going to ship with Donut 1.6 since that will be the first version to use CDMA and in videos I have seen online there are a few of the Phones with a Google Branding on the back and there are some without it I know that it has the HTC sense UI but is there anything different about these phones with the Google Branding
I had also heard that Sprint has to sign off on the 1.6 before they can release it...that it's not up to HTC alone. That's usually the case, or at least it was with OS upgrades on BlackBerry devices with Sprint.
I e-mailed HTC today to ask this question, and got the following response:
Thank you for your inquiry regarding Android 1.6 for the HTC Hero from Sprint.
I understand it is important that you have the latest software on your device, John.
Currently no announcement has been made regarding the Android version installed from the factory on the Hero from Sprint; however, the software will be available for downloading to the device. We respectfully refer you to our developer website HTC - Developer Center for further information regarding this software.
I hope we have answered your question in detail, John. Feel free to contact us again if you have any further questions. In order to improve our service, I would like to invite you to participate in a survey on the worldwide HTC website at HTC Online Survey.