One of the improvements in version 0.8.2 is power usage : most of the internal and external devices are switched in sleep mode when the display is off to improve the battery life.
This improvement had unwanted side effect : the bootloader cannot initialize properly when the SPI NOR Flash (external flash memory) is in sleep mode. In this case, the bootloader is stuck in an infinite loop and does not run at all. The result for the end user is the display that stays black, and the device that seems bricked. The only known workaround is to wait for the battery to drain completely, which can take some time.
This bugfix version disables the sleep mode on the SPI NOR Flash to ensure that the bootloader will be able to start and run the firmware. Sleep mode will be re-enabled when we’ll be able to update the bootloader using OTA and query its version at runtime.