---[2.1.1 - Hardware Back in the 80's the BIOS firmware was contained in ROM or PROM chips, which could not be altered in any way, but nowadays, this firmware is stored in an EEPROM (Electrically Erasable Programmable Read-Only Memory). This kind of memory allows the user to reflash it, allowing the vendor to offer firmware updates in order to fix bugs, support new hardware and to add new functi..