diff --git a/app/src/main/java/com/lxmf/messenger/viewmodel/RNodeConfigValidator.kt b/app/src/main/java/com/lxmf/messenger/viewmodel/RNodeConfigValidator.kt
index 2e9158cf..a6e68707 100644
--- a/app/src/main/java/com/lxmf/messenger/viewmodel/RNodeConfigValidator.kt
+++ b/app/src/main/java/com/lxmf/messenger/viewmodel/RNodeConfigValidator.kt
@@ -49,7 +49,7 @@ object RNodeConfigValidator {
     // Hardware limits
     private const val MIN_BANDWIDTH = 7800
     private const val MAX_BANDWIDTH = 1625000
-    private const val MIN_SF = 7
+    private const val MIN_SF = 5
     private const val MAX_SF = 12
     private const val MIN_CR = 5
     private const val MAX_CR = 8
diff --git a/app/src/test/java/com/lxmf/messenger/viewmodel/RNodeConfigValidatorTest.kt b/app/src/test/java/com/lxmf/messenger/viewmodel/RNodeConfigValidatorTest.kt
index fc913bdd..5b2ad1fc 100644
--- a/app/src/test/java/com/lxmf/messenger/viewmodel/RNodeConfigValidatorTest.kt
+++ b/app/src/test/java/com/lxmf/messenger/viewmodel/RNodeConfigValidatorTest.kt
@@ -177,9 +177,9 @@ class RNodeConfigValidatorTest {
 
     @Test
     fun `validateSpreadingFactor below minimum`() {
-        val result = RNodeConfigValidator.validateSpreadingFactor("6")
+        val result = RNodeConfigValidator.validateSpreadingFactor("4")
         assertFalse(result.isValid)
-        assertTrue(result.errorMessage!!.contains("7"))
+        assertTrue(result.errorMessage!!.contains("5"))
     }
 
     @Test
@@ -191,7 +191,7 @@ class RNodeConfigValidatorTest {
 
     @Test
     fun `validateSpreadingFactor at boundaries`() {
-        assertTrue(RNodeConfigValidator.validateSpreadingFactor("7").isValid)
+        assertTrue(RNodeConfigValidator.validateSpreadingFactor("5").isValid)
         assertTrue(RNodeConfigValidator.validateSpreadingFactor("12").isValid)
     }
 
diff --git a/app/src/test/java/com/lxmf/messenger/viewmodel/RNodeWizardViewModelTest.kt b/app/src/test/java/com/lxmf/messenger/viewmodel/RNodeWizardViewModelTest.kt
index f9553a7f..a1791053 100644
--- a/app/src/test/java/com/lxmf/messenger/viewmodel/RNodeWizardViewModelTest.kt
+++ b/app/src/test/java/com/lxmf/messenger/viewmodel/RNodeWizardViewModelTest.kt
@@ -691,14 +691,14 @@ class RNodeWizardViewModelTest {
         }
 
     @Test
-    fun `updateSpreadingFactor sets error for SF below 7`() =
+    fun `updateSpreadingFactor sets error for SF below 5`() =
         runViewModelTest {
             advanceUntilIdle()
 
             viewModel.state.test {
                 awaitItem() // Initial
 
-                viewModel.updateSpreadingFactor("6")
+                viewModel.updateSpreadingFactor("4")
                 advanceUntilIdle()
 
                 val state = awaitItem()