diff --git a/README.md b/README.md
index 112be5c..fe43fc6 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ Latest released version available [here][bios-pw] and latest testing version (*s
 * Compaq — 5 decimal digits (*e.g*. ``12345``)
 * Dell	— supports such series: ``595B``, ``D35B``, ``2A7B``, ``A95B``, ``1D3B``, ``6FF1``, ``1F66``, ``1F5A`` and ``BF97``, ``E7A8``. *e.g*: ``1234567-2A7B`` or ``1234567890A-D35B`` for HDD.
 * Dell Insyde BIOS (Latitude 3540) — *e.g.* ``5F3988D5E0ACE4BF-7QH8602`` (``7QH8602`` — service tag).
-* Fujitsu-Siemens — 5 decimal digits, 8 hexadecimal digits, 5x4 hexadecimal digits, 5x4 decimal digits
+* Fujitsu-Siemens — 5 decimal digits, 8 hexadecimal digits, 5x4 and 6x4 hexadecimal digits, 5x4 decimal digits
 * Hewlett-Packard — 5 decimal digits, 10 characters
 * Insyde H20 (Acer, HP) — 8 decimal digits, 10 decimal digits or HP `i ` (lowercase and uppercase) prefixed 8 digits.
 * Phoenix (generic) — 5 decimal digits
@@ -27,14 +27,15 @@ Latest released version available [here][bios-pw] and latest testing version (*s
 ## More info
 
 * http://dogber1.blogspot.com/2009/05/table-of-reverse-engineered-bios.html
-* https://sites.google.com/site/hpglserv/Home/article
+* https://web.archive.org/web/20180913211958/https://sites.google.com/site/hpglserv/Home/article
 
 ## Thanks
 
 * [asyncritius](https://github.com/A-syncritus) — for major contribution to dell generator
-* [dogbert](https://github.com/dogbert) — researched most of generators present here
-* hpgl — for dell generator
+* [dogbert](https://github.com/dogbert) — researched many generators present here
+* hpgl — for initial dell generator
 * [let-def](https://github.com/let-def) — for Acer Insyde 10 digit
+* [polloloco](https://github.com/polloloco) — for FSI 6x4 hex (`203c-d001`)
 
 [build-status]: https://github.com/bacher09/pwgen-for-bios/actions/workflows/build-test.yml/badge.svg
 [tests]: https://github.com/bacher09/pwgen-for-bios/actions/workflows/build-test.yml
diff --git a/src/keygen/fsi.spec.ts b/src/keygen/fsi.spec.ts
index 32c6aaa..9f8b396 100644
--- a/src/keygen/fsi.spec.ts
+++ b/src/keygen/fsi.spec.ts
@@ -1,4 +1,4 @@
-import { fsi20DecNewSolver, fsi20DecOldSolver, fsi24DecSolver, fsiHexSolver } from "./fsi";
+import { fsi20DecNewSolver, fsi20DecOldSolver, fsi24DecSolver, fsi24Hex203cSolver, fsiHexSolver } from "./fsi";
 
 describe("Test Fujitsu-Siemens 5x4 hexadecimal BIOS", () => {
     it("FSI key for 1234-4321-1234-4321-1234 is 35682708", () => {
@@ -63,3 +63,12 @@ describe("Test Fujitsu-Siemens 6x4 decimal", () => {
         expect(fsi24DecSolver("1234-1234-4321-1234-4321-BEEF")).toEqual([]);
     });
 });
+
+describe("Test Fujitsu-Siemens 6x4 hex 203c-d001", () => {
+    it("FSI key for 203c-d001-0000-001d-e960-227d is 494eab7c", () => {
+        expect(fsi24Hex203cSolver("203c-d001-0000-001d-e960-227d")).toEqual(["494eab7c"]);
+    });
+    it("FSI key for 203c-d001-4f30-609d-5125-646a is 66b14918", () => {
+        expect(fsi24Hex203cSolver("203c-d001-4f30-609d-5125-646a")).toEqual(["66b14918"]);
+    });
+});
diff --git a/src/keygen/fsi.ts b/src/keygen/fsi.ts
index 1c02c28..ea66168 100644
--- a/src/keygen/fsi.ts
+++ b/src/keygen/fsi.ts
@@ -1,5 +1,6 @@
 /* eslint-disable no-bitwise */
 import { makeSolver } from "./utils";
+import { Crc32 } from "./cryptoUtils";
 
 function generateCRC16Table(): number[] {
     let table: number[] = [];
@@ -142,6 +143,25 @@ function fsi20DecNewKeygen(serial: string): string {
     }).join("");
 }
 
+/* For Fujitsu-Siemens. 6x4 203c-d001-xxxx-xxxx-xxxx-xxxx
+ * Based on: https://gitlab.com/polloloco/fujitsu-bios-unlocker/
+ */
+function fsiHex203Cd001Keygen(serial: string): string[] {
+    if (serial.length != 24) {
+        return [];
+    }
+
+    const hexSerial = Array.from({length: 6}, (_, i) => i * 4).map(i => parseInt(serial.slice(i, i + 4), 16));
+    if (hexSerial[0] != 0x203c || hexSerial[1] != 0xd001) {
+        return [];
+    }
+    let crc = new Crc32();
+    crc.update(serial.slice(8).split("").map(c => c.charCodeAt(0)));
+    // JAMCRC
+    const output = ("0".repeat(8) + ((~crc.digest()) >>> 0).toString(16)).slice(-8);
+    return [output];
+}
+
 export let fsiHexSolver = makeSolver({
     name: "fsiHex",
     description: "Fujitsu-Siemens hexdigits",
@@ -173,3 +193,11 @@ export let fsi24DecSolver = makeSolver({
     inputValidator: (s) => /^[0-9ABCDEF]{4}\d{20}$/i.test(s),
     fun: (code: string) => [fsi24DecKeygen(code)]
 });
+
+export let fsi24Hex203cSolver = makeSolver({
+    name: "fsi24Hex203c",
+    description: "Fujitsu-Siemens Hex (6x4) 203c-d001-xxxx-xxxx-xxxx-xxxx",
+    examples: ["203c-d001-0000-001d-e960-227d"],
+    inputValidator: (s) => /^[0-9ABCDEF]{24}$/i.test(s),
+    fun: (code: string) => fsiHex203Cd001Keygen(code)
+});
diff --git a/src/keygen/index.ts b/src/keygen/index.ts
index f0a95f8..1f3c212 100644
--- a/src/keygen/index.ts
+++ b/src/keygen/index.ts
@@ -1,7 +1,7 @@
 import { monotonicTime } from "../polyfills/performancePolyfill";
 import { asusSolver } from "./asus";
 import { dellHddSolver, dellLatitude3540Solver, dellSolver, hddOldSolver } from "./dell";
-import { fsi20DecNewSolver, fsi20DecOldSolver, fsi24DecSolver, fsiHexSolver } from "./fsi";
+import { fsi20DecNewSolver, fsi20DecOldSolver, fsi24DecSolver, fsiHexSolver, fsi24Hex203cSolver } from "./fsi";
 import { hpAMISolver } from "./hpami";
 import { hpMiniSolver } from "./hpmini";
 import { acerInsyde10Solver, hpInsydeSolver, insydeSolver } from "./insyde";
@@ -31,6 +31,7 @@ export const solvers: Solver[] = [
     fsi20DecNewSolver,
     fsi20DecOldSolver,
     fsi24DecSolver,
+    fsi24Hex203cSolver,
     hpMiniSolver,
     hpInsydeSolver,
     hpAMISolver,