2024-03-01 13:42:59 +00:00
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---
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2024-03-01 13:48:59 +00:00
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title: ThinkPad W541 external flashing
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2024-03-01 13:42:59 +00:00
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x-toc-enable: true
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...
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Buy Libreboot preinstalled
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==========================
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This laptop is available to buy with Libreboot pre-installed:
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<https://minifree.org/product/libreboot-w541/>
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Introduction
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============
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NOTE: Libreboot standardises on [flashprog](https://flashprog.org/wiki/Flashprog)
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now, as of 27 January 2024, which is a fork of flashrom.
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**[PLEASE READ THESE INSTRUCTIONS BEFORE INSTALLING](../../news/safety.md),
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OR YOU MIGHT BRICK YOUR MACHINE: [SAFETY PRECAUTIONS](../../news/safety.md)**
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Read the [Ivybridge/Haswell common guide](/docs/install/ivy_has_common.html) if you want more information.
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All of the following instructions assume that you've cloned lbmk and are operating from the
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root of that project. To do so, run
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git clone https://codeberg.org/libreboot/lbmk
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cd lbmk
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You can now follow the rest of the instructions.
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Warning: external flashing notes
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================================
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This machine cannot be easily flashed externally. It is recommended
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to set a higher drive strength on your programmer; anything 12mA to
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16mA should be fine.
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When flashing one of the two chips, you must tie the chip select high
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on the other one. More testing is needed.
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The only currently known-reliable way of flashing it is to de-solder both
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ICs, flash them in a socket and solder them back. You could alternatively
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use WSON8 sockets, and install WSON8 ICs in them.
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Here are some photos of the flashes being soldered and re-soldered:
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<img tabindex=1 class="l" src="https://av.libreboot.org/w541/flash_removed.jpg" /><span class="f"><img src="https://av.libreboot.org/w541/flash_removed.jpg" /></span>
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<img tabindex=1 class="l" src="https://av.libreboot.org/w541/flash_soldered.jpg" /><span class="f"><img src="https://av.libreboot.org/w541/flash_soldered.jpg" /></span>
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Flash the chip in a socket:
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<img tabindex=1 class="l" src="https://av.libreboot.org/hp2170p/ch341a_socket_soic8.jpg" /><span class="f"><img src="https://av.libreboot.org/hp2170p/ch341a_socket_soic8.jpg" /></span>
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NOTE: The pictured flasher is a CH341A, but it's modified to have 3.3v logic levels
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and pull-up resistors on WP/HOLD - the unmodified one is unsafe to sue on this machine, unless
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you use a model with 3.3v flash (e.g. some of the green models). More info available
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in the [SPI flashing guide](spi.md).
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