Microsoft does wants to keep its product clean and simple looking so during firmware updates they use a colored bar under the Surface logo to give the user a calm sense of what is happening.

The problem is that even techs that work on these frequently are not sure what exactly is going on so we have produced this list:

PROGRESS BAR COLORFIRMWARE BEING UPDATED
BLUESurface UEFI firmware update
GREENSystem Embedded Controller firmware update
ORANGESAM Controller firmware update
REDIntel Management Engine firmware
GRAY / GREYSurface touch firmware
LIGHT GREENSurface KIP firmware
LIGHT PINKSurface ISH firmware
PINKSurface Trackpad firmware
LIGHT GRAYSurface TCON firmware
PURPLESurface TPM firmware

 

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