diff --git a/CHANGELOG.md b/CHANGELOG.md
index 275a264..4d58b87 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,27 @@ e este projeto segue [Versionamento Semântico](https://semver.org/lang/pt-BR/sp
 
 ## [Unreleased]
 
+## [3.3.1] — 2026-07-30
+
+### Corrigido
+
+- **Inutilização de NF-e** (`fix-product-invoice-disablement-epec`): `disable()` e
+  `disableRange()` de `ProductInvoicesResource` emitiam `PUT …/disable` — rota que
+  **não existe** na API (405/404, sondado ao vivo em 2026-07-29). Agora emitem
+  `POST …/{invoiceId}/disablement` e `POST …/productinvoices/disablement`, conforme
+  `openapi/nf-produto-v2.yaml`. Assinaturas públicas inalteradas.
+  - Em `disable()`, o `reason` de `$data` é promovido a query param (contrato do
+    endpoint individual); a API exige 15–255 caracteres (erro `40001`).
+  - Em `disableRange()`, o body segue o `DisablementResource` da spec; `reason` é
+    obrigatório (`400 "The Reason field is required"`).
+- **Download de EPEC**: `downloadEpecXml()` usava `GET …/xml/epec` (404 de rota
+  inexistente); agora usa a rota real `GET …/xml-epec`. `downloadRejectionXml()`
+  não muda (`/xml/rejection` e `/xml-rejection` são aliases vivos, sondado).
+- Testes: verbo+path dos três métodos pinados em unit tests; novo teste de
+  alinhamento `ProductInvoiceSpecAlignmentTest` amarra as rotas à spec (e pina a
+  ausência das rotas mortas). Rotas novas validadas ao vivo com o SDK corrigido
+  em 2026-07-30 (400 de validação / `40401 invoice not found` — nada inutilizado).
+
 ## [3.3.0] — 2026-07-09
 
 ### Adicionado
diff --git a/docs/recursos/product-invoices.md b/docs/recursos/product-invoices.md
index 14549e4..2265558 100644
--- a/docs/recursos/product-invoices.md
+++ b/docs/recursos/product-invoices.md
@@ -154,6 +154,14 @@ $nfe->productInvoices->disableRange($companyId, [
 ]);
 ```
 
+:::note `reason` é obrigatório na inutilização
+Em `disableRange()`, a API rejeita a ausência de `reason` com
+`400 "The Reason field is required"`. Em `disable()`, o `reason` informado em
+`$data` é enviado como parâmetro de query (contrato da API para o endpoint
+individual) e precisa ter entre 15 e 255 caracteres (erro `40001`). Para
+inutilizar um único número via faixa, use `beginNumber` igual a `lastNumber`.
+:::
+
 ## Próximos passos
 
 - [Notas de consumidor (NFC-e)](./consumer-invoices.md) — modelo 65.
diff --git a/skills/nfeio-php-sdk/references/product-invoices-and-taxes.md b/skills/nfeio-php-sdk/references/product-invoices-and-taxes.md
index a9a796f..dc7bbd2 100644
--- a/skills/nfeio-php-sdk/references/product-invoices-and-taxes.md
+++ b/skills/nfeio-php-sdk/references/product-invoices-and-taxes.md
@@ -19,8 +19,8 @@ downloadEpecXml(string $companyId, string $invoiceId, ?RequestOptions $options =
 sendCorrectionLetter(string $companyId, string $invoiceId, string $correction, ?RequestOptions $options = null): array
 downloadCorrectionLetterPdf(string $companyId, string $invoiceId, ?RequestOptions $options = null): string
 downloadCorrectionLetterXml(string $companyId, string $invoiceId, ?RequestOptions $options = null): string
-disable(string $companyId, string $invoiceId, array $data, ?RequestOptions $options = null): array          // single: PUT .../{id}/disable
-disableRange(string $companyId, array $data, ?RequestOptions $options = null): array                        // range: PUT .../productinvoices/disable
+disable(string $companyId, string $invoiceId, array $data, ?RequestOptions $options = null): array          // single: POST .../{id}/disablement
+disableRange(string $companyId, array $data, ?RequestOptions $options = null): array                        // range: POST .../productinvoices/disablement
 ```
 
 - **`list()` requires `environment`** and its `$options` arg is mandatory (cursor pagination): `['environment' => 'Production', 'limit' => 25, 'startingAfter' => $id, 'q' => ...]`.
@@ -28,6 +28,7 @@ disableRange(string $companyId, array $data, ?RequestOptions $options = null): a
 - `cancel()` takes an optional `$reason` (appended as `?reason=`).
 - `sendCorrectionLetter()` throws `InvalidRequestException` locally if the text is empty/whitespace.
 - `listItems`/`listEvents` return raw associative arrays, not DTOs.
+- Inutilization: `disableRange()`'s `$data` follows the spec's `DisablementResource` (`serie`, `beginNumber`, `lastNumber`, `state`, `environment`, `reason`) — the API rejects a missing `reason` with `400 "The Reason field is required"`. In `disable()`, a `reason` key in `$data` is promoted to the query string (per-invoice endpoint has no request body in the spec).
 
 ## `$nfe->consumerInvoices` (NFC-e — Company-scoped)
 
@@ -46,7 +47,7 @@ disableRange(string $companyId, array $data, ?RequestOptions $options = null): a
 ```
 
 - NFC-e emission is webhook-driven. No `getStatus()`, no correction letter, no EPEC.
-- `disableRange()` here POSTs to `.../disablement` (different verb/path from product's `disable`). No per-invoice disable.
+- `disableRange()` POSTs to `.../consumerinvoices/disablement` (same verb/path shape as product's). No per-invoice disable.
 
 ## `$nfe->stateTaxes` (Inscrição Estadual / IE — Company-scoped, prerequisite for NF-e)
 
diff --git a/src/Resource/ProductInvoicesResource.php b/src/Resource/ProductInvoicesResource.php
index 3b6099c..ac11590 100644
--- a/src/Resource/ProductInvoicesResource.php
+++ b/src/Resource/ProductInvoicesResource.php
@@ -187,7 +187,7 @@ public function downloadEpecXml(string $companyId, string $invoiceId, ?RequestOp
         $companyId = IdValidator::companyId($companyId);
         $invoiceId = IdValidator::invoiceId($invoiceId);
 
-        return $this->download("/companies/{$companyId}/productinvoices/{$invoiceId}/xml/epec", options: $options);
+        return $this->download("/companies/{$companyId}/productinvoices/{$invoiceId}/xml-epec", options: $options);
     }
 
     /**
@@ -232,7 +232,12 @@ public function downloadCorrectionLetterXml(string $companyId, string $invoiceId
     }
 
     /**
-     * Inutiliza uma NF-e específica.
+     * Inutiliza uma NF-e específica (`POST …/{invoiceId}/disablement`).
+     *
+     * A spec declara `reason` como query param neste endpoint (não há request
+     * body); se `$data['reason']` for informado, é promovido à query string e
+     * o restante de `$data` segue como body. A API exige `reason` entre 15 e
+     * 255 caracteres (erro 40001).
      *
      * @param array<string, mixed> $data
      * @return array<string, mixed>
@@ -245,13 +250,23 @@ public function disable(
     ): array {
         $companyId = IdValidator::companyId($companyId);
         $invoiceId = IdValidator::invoiceId($invoiceId);
-        $response = $this->httpPut("/companies/{$companyId}/productinvoices/{$invoiceId}/disable", $data, $options);
+        $path = "/companies/{$companyId}/productinvoices/{$invoiceId}/disablement";
+        $reason = $data['reason'] ?? null;
+        if (is_string($reason) && $reason !== '') {
+            unset($data['reason']);
+            $path .= '?' . http_build_query(['reason' => $reason]);
+        }
+        $response = $this->httpPost($path, $data === [] ? null : $data, $options);
 
         return $this->decodeBody($response->body);
     }
 
     /**
-     * Inutiliza uma faixa de numeração.
+     * Inutiliza uma faixa de numeração (`POST …/productinvoices/disablement`).
+     *
+     * `$data` segue o schema `DisablementResource` da spec: `serie`,
+     * `beginNumber`, `lastNumber`, `state`, `environment` e `reason` —
+     * a API rejeita a ausência de `reason` com `400 "The Reason field is required"`.
      *
      * @param array<string, mixed> $data
      * @return array<string, mixed>
@@ -262,7 +277,7 @@ public function disableRange(
         ?RequestOptions $options = null,
     ): array {
         $companyId = IdValidator::companyId($companyId);
-        $response = $this->httpPut("/companies/{$companyId}/productinvoices/disable", $data, $options);
+        $response = $this->httpPost("/companies/{$companyId}/productinvoices/disablement", $data, $options);
 
         return $this->decodeBody($response->body);
     }
diff --git a/tests/Resource/ProductInvoiceSpecAlignmentTest.php b/tests/Resource/ProductInvoiceSpecAlignmentTest.php
new file mode 100644
index 0000000..95c4a8e
--- /dev/null
+++ b/tests/Resource/ProductInvoiceSpecAlignmentTest.php
@@ -0,0 +1,70 @@
+<?php
+
+declare(strict_types=1);
+
+use Symfony\Component\Yaml\Yaml;
+
+/**
+ * Amarra as rotas de inutilização e EPEC de ProductInvoicesResource ao contrato
+ * de openapi/nf-produto-v2.yaml: um sync de spec que mova esses paths quebra o
+ * build em vez de driftar silenciosamente. Rotas confirmadas por sonda ao vivo
+ * em 2026-07-29 (vault review-07-14-2026/09 — Sondas 2026-07-29).
+ */
+
+/**
+ * @return array<string, mixed> O spec OpenAPI completo, parseado.
+ */
+function loadProductInvoiceSpec(): array
+{
+    static $spec = null;
+    if ($spec === null) {
+        $spec = Yaml::parseFile(__DIR__ . '/../../openapi/nf-produto-v2.yaml');
+        expect($spec)->toBeArray();
+    }
+
+    return $spec;
+}
+
+it('collective disablement is POST /v2/companies/{companyId}/productinvoices/disablement', function (): void {
+    $spec = loadProductInvoiceSpec();
+
+    $op = $spec['paths']['/v2/companies/{companyId}/productinvoices/disablement']['post'] ?? null;
+    expect($op)->toBeArray();
+
+    // O body segue o schema DisablementResource, que declara `reason`
+    // (obrigatório no fio: 400 "The Reason field is required", sondado 2026-07-29).
+    $ref = $op['requestBody']['content']['application/json']['schema']['$ref'] ?? null;
+    expect($ref)->toBe('#/components/schemas/DisablementResource');
+    expect($spec['components']['schemas']['DisablementResource']['properties'])->toHaveKey('reason');
+});
+
+it('per-invoice disablement is POST …/{invoiceId}/disablement with reason as query param', function (): void {
+    $spec = loadProductInvoiceSpec();
+
+    $op = $spec['paths']['/v2/companies/{companyId}/productinvoices/{invoiceId}/disablement']['post'] ?? null;
+    expect($op)->toBeArray();
+
+    $queryParams = array_column(
+        array_filter($op['parameters'] ?? [], fn(array $p): bool => ($p['in'] ?? '') === 'query'),
+        'name',
+    );
+    expect($queryParams)->toContain('reason');
+    expect($op)->not->toHaveKey('requestBody');
+});
+
+it('EPEC XML download is GET …/{invoiceId}/xml-epec (hyphenated)', function (): void {
+    $spec = loadProductInvoiceSpec();
+
+    expect($spec['paths']['/v2/companies/{companyId}/productinvoices/{invoiceId}/xml-epec'] ?? null)
+        ->toBeArray()->toHaveKey('get');
+});
+
+it('the dead PUT …/disable and GET …/xml/epec routes stay absent from the spec', function (): void {
+    // Sondado 2026-07-29: 405 / 404 de rota inexistente. Se um sync de spec os
+    // ressuscitar, reavaliar as rotas do resource.
+    $paths = array_keys(loadProductInvoiceSpec()['paths']);
+
+    expect($paths)->not->toContain('/v2/companies/{companyId}/productinvoices/disable');
+    expect($paths)->not->toContain('/v2/companies/{companyId}/productinvoices/{invoiceId}/disable');
+    expect($paths)->not->toContain('/v2/companies/{companyId}/productinvoices/{invoiceId}/xml/epec');
+});
diff --git a/tests/Resource/ProductInvoicesResourceTest.php b/tests/Resource/ProductInvoicesResourceTest.php
index 4f5db46..3515710 100644
--- a/tests/Resource/ProductInvoicesResourceTest.php
+++ b/tests/Resource/ProductInvoicesResourceTest.php
@@ -92,3 +92,54 @@ function buildPiClient(MockTransport $mock): Client
 
     expect($bytes)->toBe($xml);
 });
+
+it('downloadEpecXml is GET to the hyphenated /xml-epec route', function (): void {
+    // Sondado 2026-07-29: /xml/epec é 404 de rota inexistente; a rota viva é /xml-epec.
+    $mock = (new MockTransport())->push(new Response(200, [], '<EPEC/>'));
+    buildPiClient($mock)->productInvoices->downloadEpecXml('abc', 'inv-1');
+
+    expect($mock->lastRequest()?->method)->toBe('GET');
+    expect($mock->lastRequest()?->path)->toBe('/v2/companies/abc/productinvoices/inv-1/xml-epec');
+});
+
+it('downloadRejectionXml keeps the live /xml/rejection alias', function (): void {
+    $mock = (new MockTransport())->push(new Response(200, [], '<rej/>'));
+    buildPiClient($mock)->productInvoices->downloadRejectionXml('abc', 'inv-1');
+
+    expect($mock->lastRequest()?->path)->toBe('/v2/companies/abc/productinvoices/inv-1/xml/rejection');
+});
+
+it('disableRange is POST to /productinvoices/disablement', function (): void {
+    // Sondado 2026-07-29: PUT …/disable → 405; a rota viva é POST …/disablement.
+    $mock = (new MockTransport())->push(new Response(204, [], ''));
+    buildPiClient($mock)->productInvoices->disableRange('co-1', [
+        'serie' => 1,
+        'beginNumber' => 10,
+        'lastNumber' => 10,
+        'reason' => 'quebra de sequência',
+    ]);
+
+    expect($mock->lastRequest()?->method)->toBe('POST');
+    expect($mock->lastRequest()?->path)->toBe('/v2/companies/co-1/productinvoices/disablement');
+    $body = json_decode($mock->lastRequest()?->body ?? 'null', associative: true);
+    expect($body)->toMatchArray(['reason' => 'quebra de sequência', 'serie' => 1]);
+});
+
+it('disable is POST to /productinvoices/{id}/disablement with reason promoted to query', function (): void {
+    // Spec: no endpoint individual, `reason` é query param (não há request body declarado).
+    $mock = (new MockTransport())->push(new Response(204, [], ''));
+    buildPiClient($mock)->productInvoices->disable('co-1', 'inv-1', ['reason' => 'nota em duplicidade']);
+
+    $sent = $mock->lastRequest();
+    expect($sent?->method)->toBe('POST');
+    expect($sent?->path)->toBe('/v2/companies/co-1/productinvoices/inv-1/disablement?' . http_build_query(['reason' => 'nota em duplicidade']));
+    expect($sent?->body)->toBeNull();
+});
+
+it('disable without reason posts to /disablement with no query', function (): void {
+    $mock = (new MockTransport())->push(new Response(204, [], ''));
+    buildPiClient($mock)->productInvoices->disable('co-1', 'inv-1', []);
+
+    expect($mock->lastRequest()?->method)->toBe('POST');
+    expect($mock->lastRequest()?->path)->toBe('/v2/companies/co-1/productinvoices/inv-1/disablement');
+});