ROM and Firmware update

[tauran121]

if i do a ROM update and then later update do a firmware update to 2.1 will it delete my previous ROM update or will stay intact with the latest update?

 

[brykins]

ROM update and firmware updates are the same thing AFAIK. Any update available now is just a minor update to 1.5 and it may fix a few niggles but nothing much. An update in the future to 2.1 WILL wipe your phone totally (except the SD card) and remove 1.5 and replace it with 2.1

 

[Xyro]

ROM stands for Read Only Memory and in this case refers to the phone's internal memory, where the android OS is stored and so on. When you apply a new ROM you're just wiping the Read Only Memory of your phone and replacing it with a fresh copy that contains newer firmware. So don't think of the ROMs HTC release as being a feature of your phone you can update, they're just containers for new versions of firmware basically.

So like brykins says, the current ROMs available are simply going to give you a slightly tweaked version of Android 1.5. The 2.1 ROMs will replace the 1.5 firmware with 2.1.