For example, an overloaded capacitor in a circuit may explode, thus stopping the flow of electricity and bricking the device. More complex examples involve permanent damage to integrated circuits and processors. Fixing such hardware bricks involve replacing these components entirely or fixing them by either bypassing if the circuit allows or other methods. Most devices can be hard bricked in a variety of ways. Resolution generally follows a process of analyzing the boot process, determining the sub-type of hard brick, and making changes with the help of external (non-bricked) devices. Soft brick A "soft bricked" device may show signs of life, but fails to boot or may display an error screen. Soft bricked devices can usually be fixed relatively easily; for example, a soft bricked iOS device may display a screen instructing the user to plug it into a computer to perform an operating system recovery using iTunes computer software. In some cases, soft bricked devices are unable to be repaired without physical repairs being carried out; an example of this would be an iOS device locked with iCloud Activation Lock, of which the only solution is to contact the owner of the iCloud account the device is locked to, or to replace the entire logicboard with a non-locked board. Un-bricking Some android devices that become "bricked" because the contents of their nonvolatile memory are incorrect can be "un-bricked" using separate hardware (a debug board) that accesses this memory directly. This is similar to the procedure for loading firmware into a new device when the memory is still empty. This kind of "bricking" and "un-bricking" occasionally happens during firmware testing and development. In other cases software and hardware procedures, often complex, have been developed that have a good chance of un-bricking the device. There is no general method; each device is different. There are also user-created modifier programs to use on bricked or partially bricked devices to make them functional. Examples include the Wiibrew program BootMii used to fix semi-bricked Nintendo Wiis, the Odin program used to flash firmware on Samsung Android devices, or the fastboot Android protocol which is capable of re-flashing a device with no software installed. A soft bricked rooted Kindle Fire can be un-bricked by using unrooting tools. A personal computer may be un-bricked by using various means of restoring techniques, from internal ones through the "Backup and Reset" feature, or external one using an external