diff --git a/CHANGELOG.md b/CHANGELOG.md
index b42045f..1659d13 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,10 +2,14 @@
 
 ## Versión actual
 
-- Versión base: `1.2.18`
+- Versión base: `1.2.19`
 
 ## Historial
 
+### 1.2.19 - 2026-05-21
+
+- Backend normaliza estilos de firma antes de validar, aceptando variantes de texto y evitando fallos intermitentes al guardar `FirmaEC`.
+
 ### 1.2.18 - 2026-05-21
 
 - Backend vuelve tolerante el guardado de preferencias de firma para aceptar clientes parciales o legados y evitar errores al guardar `FirmaEC`.
diff --git a/DEPLOY_ANDROID.md b/DEPLOY_ANDROID.md
index 19a8807..c0ddbb7 100644
--- a/DEPLOY_ANDROID.md
+++ b/DEPLOY_ANDROID.md
@@ -2,7 +2,7 @@
 
 ## Versión actual
 
-- Base actual: `1.2.18`
+- Base actual: `1.2.19`
 - Fuente de verdad: [VERSION](/home/mgonzalez/desarrollo/react/linkedsign/VERSION)
 - Historial de cambios: [CHANGELOG.md](/home/mgonzalez/desarrollo/react/linkedsign/CHANGELOG.md)
 
diff --git a/DEPLOY_WEB.md b/DEPLOY_WEB.md
index 6ca3cf5..8afcb99 100644
--- a/DEPLOY_WEB.md
+++ b/DEPLOY_WEB.md
@@ -2,7 +2,7 @@
 
 ## Versión actual
 
-- Base actual: `1.2.18`
+- Base actual: `1.2.19`
 - Fuente de verdad: [VERSION](/home/mgonzalez/desarrollo/react/linkedsign/VERSION)
 - Historial de cambios: [CHANGELOG.md](/home/mgonzalez/desarrollo/react/linkedsign/CHANGELOG.md)
 
diff --git a/PRODUCCION.md b/PRODUCCION.md
index 386f34e..d29d333 100644
--- a/PRODUCCION.md
+++ b/PRODUCCION.md
@@ -2,7 +2,7 @@
 
 ## Versión actual
 
-- Base actual: `1.2.18`
+- Base actual: `1.2.19`
 - Fuente de verdad: [VERSION](/home/mgonzalez/desarrollo/react/linkedsign/VERSION)
 - Historial de cambios: [CHANGELOG.md](/home/mgonzalez/desarrollo/react/linkedsign/CHANGELOG.md)
 
diff --git a/VERSION b/VERSION
index 591bdbc..9ddbe16 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.2.18
+1.2.19
diff --git a/android/app/build.gradle b/android/app/build.gradle
index d1d6718..2c388dc 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -18,8 +18,8 @@ android {
         applicationId "net.linkedcorp.linkedsign"
         minSdk 26
         targetSdk 35
-        versionCode 10218
-        versionName "1.2.18"
+        versionCode 10219
+        versionName "1.2.19"
 
         buildConfigField "String", "API_BASE_URL", "\"${apiBaseUrl}\""
     }
diff --git a/backend/package.json b/backend/package.json
index a78bf24..bc74746 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "linkedsign-backend",
-  "version": "1.2.18",
+  "version": "1.2.19",
   "private": true,
   "description": "Initial backend for LinkedSign",
   "main": "src/server.js",
diff --git a/backend/src/modules/users/users.service.js b/backend/src/modules/users/users.service.js
index 8d035eb..47d4cc0 100644
--- a/backend/src/modules/users/users.service.js
+++ b/backend/src/modules/users/users.service.js
@@ -6,6 +6,8 @@ const ALLOWED_QR_BACKGROUNDS = ['transparent', 'soft'];
 const ALLOWED_QR_BORDERS = ['none', 'line'];
 const LEGACY_SIGNATURE_STYLE_MAP = {
   image: 'qr',
+  firmaecuador: 'firmaec',
+  'firma ec': 'firmaec',
 };
 
 const getSignaturePreferences = async (userId) => {
@@ -13,7 +15,8 @@ const getSignaturePreferences = async (userId) => {
 };
 
 const updateSignaturePreferences = async (userId, { signatureStyle, qrPosition, qrBackground, qrBorder, signatureImageBase64 }) => {
-  const normalizedSignatureStyle = LEGACY_SIGNATURE_STYLE_MAP[String(signatureStyle || '').toLowerCase()] || signatureStyle;
+  const rawSignatureStyle = String(signatureStyle || '').trim().toLowerCase();
+  const normalizedSignatureStyle = LEGACY_SIGNATURE_STYLE_MAP[rawSignatureStyle] || rawSignatureStyle || 'qr';
   if (!ALLOWED_SIGNATURE_STYLES.includes(normalizedSignatureStyle)) {
     const error = new Error('Invalid signature style.');
     error.statusCode = 400;
diff --git a/frontend/package.json b/frontend/package.json
index 4db5e26..84b60ec 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "frontend",
   "private": true,
-  "version": "1.2.18",
+  "version": "1.2.19",
   "type": "module",
   "scripts": {
     "dev": "vite",