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The word "brick", when used in reference to consumer electronics, describes an electronic device such as a smartphone, game console, router, or tablet computer that, due to a serious misconfiguration, corrupted firmware, or a hardware problem, can no longer function, hence, is as technologically useful as a brick.
The term derives from the vaguely cuboid shape of many electronic devices (and their detachable power supplies) and the suggestion that the device can function only as a lifeless, square object, paperweight or doorstop.
This term is commonly used as a verb. For example, "I bricked my MP3 player when I tried to modify its firmware." It can also be used as a noun, for example, "If it's corrupted and you apply using fastboot, your device is a brick."
In the common usage of the term, "bricking" suggests that the damage is so serious as to have rendered the device permanently unusable.
Cause and prevention
Bricking a device is usually a result of interrupting an attempt to update the device. Many devices have an update procedure that must not be interrupted before completion; if interrupted by a power failure, user intervention, or any other reason, the existing firmware may be partially overwritten and unusable. The risk of corruption can be minimized by taking all possible precautions against interruption.
Installing firmware with errors or for a different revision of the hardware, or installing firmware incompetently patched such as DVD firmware that only plays DVDs sold in a particular region, can also cause bricking.
Some devices include two copies of firmware, one active and the other stored in fixed ROM or writable non-volatile memory and not normally accessible to processes that could corrupt it, as well as a way to copy the stored firmware over the active version, even if corrupt, so that if the active firmware is damaged, it can be replaced by the copy and the device will not be bricked. Other devices have minimal "bootloader" firmware, enabled usually by operating a switch or jumper, which does not enable the device to work normally but can reload the main firmware.
Bricking is classified into two types, namely hard and soft, depending on the device's ability to function.
Hard bricked devices generally show little to no signs of life. A hard bricked device doesn't power on or show any vendor logo, in essence, the screen remains turned off. Some of the major reasons for hard bricking are installing firmware not made for the device, interrupted flashing procedure or following a flashing procedure incorrectly.
Some other reasons include flashing a root file for a different file or using wrong commands. Some kernel bugs have been known that affect the /data partition in the eMMC chip, which gets corrupted during certain operations such as wiping and flashing.
Recovering from a hard brick is generally considered difficult and requires the use of a more direct programming interface to the controller; such an interface exists as there must be a way to program the initial firmware on an unprogrammed device. However, additional tools or connections may be needed.
Apart from that, there are different stages of a bricked device. There are different steps to resolve this issue and this includes: Analyzing the problem, also needs some changes on the PC, analyzing the process, and at which stage the hard brick device is. 
A "soft bricked" device may show signs of life, but boots unsuccessfully or may display an error screen. Soft bricked devices can usually be fixed; 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 software.
Some devices that become "bricked" because the contents of their nonvolatile memory are incorrect can be "unbricked" 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 "unbricking" 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 unbricking 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 reflashing a device with no software installed.
In principle any device with rewritable firmware, or certain crucial settings stored into flash or EEPROM memory, can be bricked. Many, but not all, devices with user-updatable firmware have protection against bricking; devices intended to be updated only by official service personnel generally do not.
Amongst devices known to have bricking issues are: older PCs (more recent models often have dual BIOSes or some other form of protection), many mobile phones, handheld game consoles like the PlayStation Portable and Nintendo DS, video game consoles like the Nintendo Wii, Xbox 360, PlayStation 4 and Xbox One, many SCSI devices and some lines of hard disk drives and routers.
At least some older consumer market router models can become unresponsive when the user tries to define a subnet mask that does not contain one contiguous run of 1s and then 0s. If even a single bit is set so that it breaks one of the runs, the router may become bricked, unresponsive to any standard troubleshooting or resolving procedures listed in the manual. Unbricking the router may require opening the case, shorting some jumper pins on the board, then connecting the router by the USB cable to an old PC with USB 1.1 hardware, running a special DOS level program supplied by the manufacturer, and powering the router up. This procedure will flash the router to factory settings and original firmware.
Sometimes an interrupted flash upgrade of a PC motherboard will brick the board, for example, due to a power outage (or user impatience) during the upgrade process. It is sometimes possible to unbrick such a motherboard, by scavenging a similar but otherwise broken board for a BIOS chip in the hopes that the BIOS will work even halfway, far enough to boot from floppy. Then it will be possible to retry the flash process. Sometimes it is possible to boot from a floppy, then swap the old presumably dead BIOS chip in and reflash it. On some Gigabyte boards, it can also be possible to reflash the bricked main BIOS using a backup BIOS.
Online and mobile services
Many newer systems capable of accessing online services (such as the Xbox One, PlayStation 4 and iPhone) have internal hardware-based unique identifiers, allowing individual systems to be tracked over a network and banned from accessing certain online services. Banned systems usually continue to operate for purposes unrelated to the online service, but they are often considered "bricked" by users of the online service.
Mobile telephones have a fixed identification code, the IMEI; a telephone reported stolen can have its IMEI blocked by networks—effectively bricked—although anyone with the necessary expertise and equipment can usually change the IMEI.
In 2011, US Senator Chuck Schumer (D-NY) proposed that phones be "bricked" when reported stolen. Some local police chiefs agreed. However, in 2013, this was rejected by mobile carriers because "If created, this capability would be in every handset and the 'kill' message would be known to every operator and therefore could not be kept secret." Which could be an issue if it fell into the hands of someone with malicious intent.
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