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# PicoShim # PicoShim
The smallest shim ever (that boots while still being signed) ## The smallest shim to ever come out (so far)
<br>
# Overview
PicoShim is a shim made for complete minimalism.
It is the smallest shim thats able to be made (as of 10/9/24) without modifying the kernel partition ### THIS REQUIRES A USB AND BASIC INSTRUCTION FOLLOWING SKILLS
# Build instructions ## How to use this
Run these commands in a **LINUX** terminal, WSL is not guaranteed to work and will not recieve support. **1.** Find your board, this can be done by going to `chrome://version` and then looking for the "Platform" entry. <br />
``` **1a.** Once found, look at the **last** word in the line, that is your board.<br />
git clone https://github.com/kxtzownsu/PicoShim **2.** Download a shim at https://dl.kxtz.dev/ChromeOS/shims/PicoShim<br />
cd PicoShim/builder **2a.** Shims are in the `<boardname>.zip` format<br />
sudo bash builder.sh /path/to/raw-shim.bin **3.** Open the Chrome Recovery Utility (or flasher of your choice) and open the file, and then select your USB.<br />
``` **4.** Once the image is done flashing, remove all external media (CD, USB, SD) and press ESC+REFRESH+PWR<br />
Now flash `/path/to/raw-shim.bin` to a USB and boot it in Developer Mode Recovery (dev=1 reco=1) **5.** Insert your newly-flashed USB <br />
**6.** enjoy the smallest shim thats bootable with MP keys as of 9/11/24<br />
# Credits
kxtzownsu - writing picoshim builder
olyb - shim shrinking code ## How to compile a shim
**1.** Clone the repository with `git`, `git clone https://git.kxtz.dev/PicoShim`<br />
**1a.** If git.kxtz.dev is down, you can use <https://github.com/kxtzownsu/PicoShim><br />
**2.** cd into the newly-cloned repo with `cd PicoShim`<br />
**3.** cd into the `builder` folder<br />
**4.** Move your shim into the `builder` folder <br />
**5.** Run `sudo bash picobuilder.sh /path/to/shim.bin`<br />
**6.** Your shim should now be less than 50MiB when done.<br />
vk6 - initramfs extraction code ## GitHub
https://github.com/kxtzownsu/PicoShim
## Credits
kxtzownsu - writing picoshim & the builder
ading2210 (vk6) - the extract_initramfs code
BinBashBanana (Olyb) - the shim shrinking code