It is just a wson-8 flash rom, whose soldering plates are compatible
with those for soic-8 chips, often found on thinkpads produced when 8MiB
soic-8 chip are hardly available.
The common way to deal with wson-8 chips is to blow it off with hot air
blower, suck up its content, and finally replace it with a soic-8 chip.
There is an article mentioned wson-8 chips:
在 2017年08月06日 00:01, Philipp Stanner 写道:
> Hi list,
> I don't know if it's common yet (the wiki article doesn't mention it)
> but today I discovered that there are Lenovo Thinkpads with very flat
> SMD-Flash-ROMs which make it impossible to access them with a SOIC-Clip
> or flash them by soldering wires to the pins directly.
> I aborted the flashing but am going to try finding a work-around.
> About the laptop:
> Type 4298-W28 S/N R9-E4CFC 11/06 (so probably manufactured in 2011)
> Product ID: 4298W28
> Maybe we should write one sentence in the wiki mentioning that not all
> chips are accessable very comfortably.
> PS: Rantmode: Why the hell don't they just solder a socket? It's not
> that unrealistic that someone bricks the BIOS while updating the
> firmware from time to time. Being able to replace the ROM with a fresh
> one is a huge plus.
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