[there]

i've never seen an android device be able to be upgraded that way, and i work on an android rom.

even on the nexus phones which are arguably the most friendly to installing a custom rom, you have to hook the phone up to a computer, install the android sdk for usb drivers and download a fastboot binary, run "fastboot oem unlock", erase all of your phone's data, then install the custom rom and set everything back up.

on nearly every other phone, the process is much more complicated involving hacks to get around a locked bootloader. i remember doing this on my mytouch 3g and the process involved 2 microsd cards, a hex editor, and a strange website where i had to type in some serial number or something from my phone and download a specially crafted binary for it to put on one of the sd cards.