[k_semler]

Correct. For instance, the EnergyROM series does not flash a new bootscreen. While some may find this annoying, I use this to my advantage, because it allows me to retain my custom bootscreen in between each update of the ROM. A ROM image is capable of flashing any and/or all of the following: Stock SPL, OS, Boot Screen, Radio. Most custom ROMs only flash the OS. Quite a bit of customised ROMs flash the boot screen also. Some flash the radio to the "optimized version" but many do not. it is expected that if you know how to flash a ROM, you are fully capable of flashing whatever radio you wish to have on your phone, and many users, (such as myself), use a custom boot screen that saves 30s by not having to re-flash your custom boot screen, so many customized ROMs do not include a boot screen.