Terms of Service

Effective: 2026-10-14 · Last updated: 2026-10-14

These terms apply to your use of this site, okwujun.pw (the "Site"; the legacy csi.okwujun.pw host remains available for compatibility), and to any purchase of digital products from the Site (the "Products"). The Site is operated by Router CSI Lab. By ordering, downloading or using a Product you confirm that you have read and accepted these terms. If you do not agree, please do not purchase.

1. What we sell

We sell digitally delivered technical documentation and tooling, currently:

• the Wi-Fi CSI on a Router practical handbook, PDF, Chinese edition (v0.1, 30 pages, continuously expanded);
• a companion reproduction script pack (capture, analysis, watchdog, bandwidth switching);
• the sample data and checksum notes shipped with the Product.

A free 5-page preview PDF and free technical articles are available so you can judge whether the Product fits your needs before buying.

We do not sell physical goods, and we do not sell one-to-one remote coaching, device flashing services, device configuration services or on-site work.

2. Delivery

Digital Products are delivered immediately after a successful payment (download link or access entry); the exact mechanism is shown on the checkout completion page and in the confirmation email. If you have not received the delivery information within 24 hours of a successful payment, email us and we will resend it.

3. Pricing, payment and the checkout platform

• Product prices are one-off purchase prices (currently USD 19 / CNY 69). They are not subscriptions, do not renew automatically, and there is no "cancel subscription" flow.
• The price shown at checkout governs. If your billing address is in a jurisdiction that imposes sales tax, VAT or GST, the checkout platform calculates and collects it under its own rules, so the amount you actually pay may be slightly higher than the listed price.
• Online payments are processed by a third-party Merchant of Record (the "Checkout Platform"). For that transaction the Checkout Platform is the legal seller of record: it collects the money, issues receipts or invoices, handles consumer taxes and manages chargebacks. The Checkout Platform is named on the checkout page; you can also ask us which provider is currently in use before paying.
• We do not receive or store your card number or payment credentials. Please never send card numbers, passwords or verification codes to us by email.

4. Refunds, cancellation and withdrawal rights

Digital content can be copied indefinitely, so we ask you to try the free preview first and we apply the following refund rules:

1. Once the full edition has been downloaded, we generally do not offer no-reason refunds. Please download the free preview and read the free articles before purchasing.
2. We will issue a full refund (or an equivalent remedy) when:
   • payment succeeded but the Product was not delivered, or the files are corrupted or cannot be downloaded and we cannot fix this within a reasonable time;
   • the same order was charged more than once;
   • the Checkout Platform's rules or mandatory law in your country give you a stronger refund or withdrawal right.
3. Mandatory withdrawal rights (for example the EU/UK right of withdrawal for digital content): where applicable law grants you a statutory withdrawal period, contact us within that period and we will process the refund through the Checkout Platform. In that case the mandatory law prevails and paragraph 1 does not apply.
4. Refund route: refunds are returned by the Checkout Platform through the original payment method. The Checkout Platform may charge a refund processing fee, and the original transaction fee is normally not returned; its published rules and the checkout page govern.
5. Chargebacks: if you have a question about a charge, please contact us first. Raising a chargeback with your bank adds fees for everyone and takes much longer to resolve.

5. Licence and intellectual property

• Copyright in the handbook, scripts, dataset notes and Site content belongs to Router CSI Lab (third-party open source components remain under their own licences).
• On purchase we grant you a non-exclusive, non-transferable licence for personal use or use inside your own team:
  • you may read, print, run the scripts on your own devices, and adapt the scripts for your own projects;
  • you may not resell, redistribute, upload publicly, bundle into a paid product or distribute as course material;
  • you may not remove copyright, licence or attribution notices.
• For distribution, teaching or commercial integration licences, contact us first.

6. Disclaimers and risk

The Site provides technical research and engineering material, not professional engineering, legal, medical or safety advice.

• Hardware and flashing risk: flashing firmware, changing radio parameters or running capture software can brick a device, lose data, disrupt a network or breach local radio regulations. You make those decisions and accept those risks yourself. Always read the recovery procedure for your device first.
• No compatibility guarantee: the handbook is validated primarily on the GL-MT6000 (MT7986). Other devices, firmware versions or kernel versions may need extra work; we do not guarantee that it works on unvalidated hardware.
• Permitted use: the Product may only be used on devices you own or environments you are explicitly authorised to test. You must not use it for non-consensual surveillance, tracking or identification of people, for medical diagnosis or health decisions, or in any way that breaks local law or privacy rules.
• To the extent permitted by applicable law, we are not liable for indirect losses arising from use of, or inability to use, the Site content.

7. Acceptable conduct and termination of access

We may terminate access to purchased content and refuse further service, and where appropriate report the matter to the Checkout Platform, if you:

• pirate, resell or bulk-redistribute purchased content;
• abuse chargebacks, use stolen payment credentials or obtain Products fraudulently;
• use the content for unlawful activity or to infringe other people's privacy or intellectual property;
• attack, scan or otherwise interfere with the Site or its hosting providers.

8. Privacy

How we handle email contact, server logs, cookies and advertising data is described in the Privacy Policy. In short: this is a static site, we do not require accounts or logins, we do not sell personal information, and payment-related personal data is processed by the Checkout Platform under its own privacy policy.

9. Limitation of liability

To the maximum extent permitted by applicable law, our aggregate liability under these terms is limited to the amount you actually paid for the Product. Nothing in this section excludes or limits liability that cannot lawfully be excluded or limited (for example liability for intent or gross negligence causing personal injury).

10. Changes to these terms

We may update these terms when the Product, the platforms or the law change, and will update the "Last updated" date at the top of this page. Changes do not affect transactions completed before the change; material changes will be highlighted on this page.

11. Governing law and disputes

These terms (and the product licence relationship between you and the Site) are governed by the laws of the People's Republic of China, and disputes are handled by the competent court where the Site operator is located. Note that an individual payment transaction is also subject to the Checkout Platform's own terms; that platform may apply the laws of Hong Kong or another jurisdiction and may ask you to accept its terms separately at checkout.

12. Contact

For terms, refunds, licensing and partnerships: okwujun@gmail.com (we normally reply within 3 business days).