I don't have a PB628, so I write about the PB 626.
There is one boot partition (not system partition, that is another one).
In this boot partition a file vcom has the value stored. Content of my boot partition, yours might vary slightly:
linux (folder)
320_G110_AA9224_ED060XD4U2_TC.wbf
bImage
boot.axf
boot.ini
default.wbf
drv_de.drv
hwconfig
hwconfig.upd
low_pwr.bmp
magic.bin
REV
script.bin
script0.bin
sprite.axf
V220_C189_WR7801_ED060XC3C1_TC.wbf
vcom
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