You need to solder the wires on the BIOS chip pins (which is found between
the RAM slots and the full-sized mPCIe slot, under the black protection
foil). These pins are very tiny and the most fragile, especially the CS (Chip
Select pin), and the GND (Ground) pin is particularly difficult to solder on,
but besides these considerations, they are flash pins. The wires will be
soldered on the pins of the BIOS flash chip.
The T400s is nothing like the T400, structure-wise. The board has the
components differently arranged, the screw's positions are different, both
RAM modules and both mPCIe slots are easily accessible from the back side of
the laptop. The '4' in the model name "T400s" is only because the screen size
is 14 inch (with LED-backlight and 1440x900 resolution). The T4*0s series are
very different than their T4*0 counterparts. If you want to make a
comparison, it's safer to make it with the X2*0 series.
Tiberiu
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communication via Google.
