What is the memory used to store essential firmware in avionics system? ?

The memory used to store essential firmware in avionics systems is typically non-volatile memory, such as flash memory or EEPROM (Electrically Erasable Programmable Read-Only Memory). This type of memory retains its data even when power is removed, making it ideal for storing critical firmware that is necessary for the operation of the avionics system.

ROM (Read-Only Memory)