flash-solo-hacker

flash-solo-hacker is a skill for Claude Code, Codex from solokeys/solo2. It costs 91 tokens per session (1,113 once invoked), scanned A, original, Apache-2.0.

A build-and-flash procedure for custom firmware on a Solo 2 Hacker hardware key. It checks the key's lock state and storage mode, validates the matching build on a recoverable EVK development board, and then writes it to the key.

In plain words
What is it for?
It helps build compatible firmware, test the equivalent EVK version, distinguish Secure from Hacker keys, and safely flash the correct image.
Why use it?
Incorrect firmware, storage settings, or lock-state handling can leave the key unusable, so the procedure adds checks before the irreversible step.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit It helps build compatible firmware, test the equivalent EVK version, distinguish Secure…

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Install with agentmods
npx agentmods add skills/solokeys/solo2/flash-solo-hacker
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add solokeys/solo2 --skill flash-solo-hacker
Clone the repo
git clone --depth 1 https://github.com/solokeys/solo2

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for flash-solo-hacker

README.md
[![agentmods](https://agentmods.dev/badge/skills/solokeys/solo2/flash-solo-hacker.svg)](https://agentmods.dev/skills/solokeys/solo2/flash-solo-hacker)
Your own site
<a href="https://agentmods.dev/skills/solokeys/solo2/flash-solo-hacker"><img src="https://agentmods.dev/badge/skills/solokeys/solo2/flash-solo-hacker.svg" alt="Measured on agentmods" height="20"></a>
Per session 91 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,113 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00091 $0.01113
Opus 5 $0.00046 $0.00557
Sonnet 5 $0.00018 $0.00223
Haiku 4.5 $0.00009 $0.00111

Measured 7d ago against content hash d0009b6fce2d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

flash-solo-hacker scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/flash-solo-hacker/SKILL.md · 74 lines

How it starts

The opening of the file, as written. The whole thing — 74 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Build & flash a Solo 2 Hacker — safely

⚠️ A Hacker key has no easily accessible debug probe (SWD exists but isn't broken out over USB like a dev board's J-Link). A flash that doesn't boot + enumerate is effectively permanently bricked — unrecoverable in practice. Read this whole skill before writing anything to a Hacker.

Golden rules

  1. EVK-first. If a dev board (LPC55S69-EVK) is available, build and validate the equivalent EVK build first (same source + features, just the EVK board target) — it has a J-Link and is fully recoverable. It is not a byte-identical binary — the EVK uses a different board target and no flash encryption — but it exercises the same code paths. Only flash the Hacker once the EVK build is proven. A bad shard/storage build has bricked a Hacker before.
  2. Match the build to the key's storage mode (see step 2). Flashing a PRINCE-encrypted build onto a plain key (or vice-versa) bricks it.
  3. Never attempt to flash custom firmware onto a Secure key — it only accepts SoloKeys-signed updates, and you must not try to unlock a user's production key (it won't work).

1. Build the firmware

git checkout <release-tag>              # reproduce a known release, or use your branch
make -C runners/lpc55 build-hacker      # → runners/lpc55/app-hacker.bin
# EVK equivalent for pre-validation:
make -C runners/lpc55 evk               # → app-hacker-evk.bin  (hacker feature set on the EVK)

2. Verify lock state and storage mode (Secure vs Hacker)

Lock state. "Secure vs Hacker" = locked vs unlocked, which is the PFR seal field — not secure boot. Read it two ways:

solo2 app admin locked     # quick: Hacker → unlocked, Secure → locked
lpc55 pfr native           # authoritative: the `seal` field — true = locked (Secure), false = unlocked (Hacker)

⚠️ seal ≠ secure boot. A key can have secure_boot_enabled set (and even the "Solo 2 Security Key" label) and still be unlocked. The seal field is the source of truth for locked/Secure vs unlocked/Hacker. Do not flash a sealed (seal = true) key — it's a Secure/production key.

Read the full file on GitHub · 74 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 7d ago First seen · 74 lines · 91 tokens per session scan A d0009b6fce2d

Subscribe to this mod's changes

flash-solo-hacker is a skill published in the GitHub repository solokeys/solo2 (708 stars, last pushed 17d ago), licensed Apache-2.0. It adds 91 tokens to every session and 1,113 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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