diff --git a/src/gps/RTC.cpp b/src/gps/RTC.cpp
index 25cd3ceff..ad26b55a4 100644
--- a/src/gps/RTC.cpp
+++ b/src/gps/RTC.cpp
@@ -397,7 +397,7 @@ uint32_t getValidTime(RTCQuality minQuality, bool local)
     return (currentQuality >= minQuality) ? getTime(local) : 0;
 }
 
-time_t gm_mktime(struct tm *tm)
+time_t gm_mktime(const struct tm *tm)
 {
 #if !MESHTASTIC_EXCLUDE_TZ
     time_t result = 0;
@@ -413,8 +413,8 @@ time_t gm_mktime(struct tm *tm)
     days_before_this_year -= 719162; // (1969 * 365 + 1969 / 4 - 1969 / 100 + 1969 / 400);
 
     // Now, within this tm->year, compute the days *before* this tm->month starts.
-    int days_before_month[12] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}; // non-leap year
-    int days_this_year_before_this_month = days_before_month[tm->tm_mon];                // tm->tm_mon is 0..11
+    static const int days_before_month[12] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334}; // non-leap year
+    int days_this_year_before_this_month = days_before_month[tm->tm_mon];                             // tm->tm_mon is 0..11
 
     // If this is a leap year, and we're past February, add a day:
     if (tm->tm_mon >= 2 && (year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0)) {
@@ -435,6 +435,7 @@ time_t gm_mktime(struct tm *tm)
 
     return result;
 #else
-    return mktime(tm);
+    struct tm tmCopy = *tm;
+    return mktime(&tmCopy);
 #endif
 }
diff --git a/src/gps/RTC.h b/src/gps/RTC.h
index 06dd34c16..cf6db0239 100644
--- a/src/gps/RTC.h
+++ b/src/gps/RTC.h
@@ -54,7 +54,7 @@ uint32_t getValidTime(RTCQuality minQuality, bool local = false);
 
 RTCSetResult readFromRTC();
 
-time_t gm_mktime(struct tm *tm);
+time_t gm_mktime(const struct tm *tm);
 
 #define SEC_PER_DAY 86400
 #define SEC_PER_HOUR 3600
diff --git a/src/graphics/draw/MenuHandler.cpp b/src/graphics/draw/MenuHandler.cpp
index c5a4106e7..6d29e9f7f 100644
--- a/src/graphics/draw/MenuHandler.cpp
+++ b/src/graphics/draw/MenuHandler.cpp
@@ -266,52 +266,8 @@ void menuHandler::FrequencySlotPicker()
 
     // Calculate number of channels (copied from RadioInterface::applyModemConfig())
     meshtastic_Config_LoRaConfig &loraConfig = config.lora;
-    double bw = loraConfig.bandwidth;
-    if (loraConfig.use_preset) {
-        switch (loraConfig.modem_preset) {
-        case meshtastic_Config_LoRaConfig_ModemPreset_SHORT_TURBO:
-            bw = (myRegion->wideLora) ? 1625.0 : 500;
-            break;
-        case meshtastic_Config_LoRaConfig_ModemPreset_SHORT_FAST:
-            bw = (myRegion->wideLora) ? 812.5 : 250;
-            break;
-        case meshtastic_Config_LoRaConfig_ModemPreset_SHORT_SLOW:
-            bw = (myRegion->wideLora) ? 812.5 : 250;
-            break;
-        case meshtastic_Config_LoRaConfig_ModemPreset_MEDIUM_FAST:
-            bw = (myRegion->wideLora) ? 812.5 : 250;
-            break;
-        case meshtastic_Config_LoRaConfig_ModemPreset_MEDIUM_SLOW:
-            bw = (myRegion->wideLora) ? 812.5 : 250;
-            break;
-        case meshtastic_Config_LoRaConfig_ModemPreset_LONG_TURBO:
-            bw = (myRegion->wideLora) ? 1625.0 : 500;
-            break;
-        default:
-            bw = (myRegion->wideLora) ? 812.5 : 250;
-            break;
-        case meshtastic_Config_LoRaConfig_ModemPreset_LONG_MODERATE:
-            bw = (myRegion->wideLora) ? 406.25 : 125;
-            break;
-        case meshtastic_Config_LoRaConfig_ModemPreset_LONG_SLOW:
-            bw = (myRegion->wideLora) ? 406.25 : 125;
-            break;
-        }
-    } else {
-        bw = loraConfig.bandwidth;
-        if (bw == 31) // This parameter is not an integer
-            bw = 31.25;
-        if (bw == 62) // Fix for 62.5Khz bandwidth
-            bw = 62.5;
-        if (bw == 200)
-            bw = 203.125;
-        if (bw == 400)
-            bw = 406.25;
-        if (bw == 800)
-            bw = 812.5;
-        if (bw == 1600)
-            bw = 1625.0;
-    }
+    double bw = loraConfig.use_preset ? modemPresetToBwKHz(loraConfig.modem_preset, myRegion->wideLora)
+                                      : bwCodeToKHz(loraConfig.bandwidth);
 
     uint32_t numChannels = 0;
     if (myRegion) {
diff --git a/src/graphics/draw/MenuHandler.h b/src/graphics/draw/MenuHandler.h
index 45fd0bf5f..1b964678b 100644
--- a/src/graphics/draw/MenuHandler.h
+++ b/src/graphics/draw/MenuHandler.h
@@ -140,7 +140,7 @@ struct ScreenColor {
     uint8_t b;
     bool useVariant;
 
-    ScreenColor(uint8_t rIn = 0, uint8_t gIn = 0, uint8_t bIn = 0, bool variantIn = false)
+    explicit ScreenColor(uint8_t rIn = 0, uint8_t gIn = 0, uint8_t bIn = 0, bool variantIn = false)
         : r(rIn), g(gIn), b(bIn), useVariant(variantIn)
     {
     }
diff --git a/src/mesh/MeshRadio.h b/src/mesh/MeshRadio.h
index f2514eea1..bbb0ee00f 100644
--- a/src/mesh/MeshRadio.h
+++ b/src/mesh/MeshRadio.h
@@ -22,4 +22,99 @@ struct RegionInfo {
 extern const RegionInfo regions[];
 extern const RegionInfo *myRegion;
 
-extern void initRegion();
\ No newline at end of file
+extern void initRegion();
+
+static inline float bwCodeToKHz(uint16_t bwCode)
+{
+    if (bwCode == 31)
+        return 31.25f;
+    if (bwCode == 62)
+        return 62.5f;
+    if (bwCode == 200)
+        return 203.125f;
+    if (bwCode == 400)
+        return 406.25f;
+    if (bwCode == 800)
+        return 812.5f;
+    if (bwCode == 1600)
+        return 1625.0f;
+    return (float)bwCode;
+}
+
+static inline uint16_t bwKHzToCode(float bwKHz)
+{
+    if (bwKHz > 31.24f && bwKHz < 31.26f)
+        return 31;
+    if (bwKHz > 62.49f && bwKHz < 62.51f)
+        return 62;
+    if (bwKHz > 203.12f && bwKHz < 203.13f)
+        return 200;
+    if (bwKHz > 406.24f && bwKHz < 406.26f)
+        return 400;
+    if (bwKHz > 812.49f && bwKHz < 812.51f)
+        return 800;
+    if (bwKHz > 1624.99f && bwKHz < 1625.01f)
+        return 1600;
+    return (uint16_t)(bwKHz + 0.5f);
+}
+
+static inline void modemPresetToParams(meshtastic_Config_LoRaConfig_ModemPreset preset, bool wideLora, float &bwKHz, uint8_t &sf,
+                                       uint8_t &cr)
+{
+    switch (preset) {
+    case meshtastic_Config_LoRaConfig_ModemPreset_SHORT_TURBO:
+        bwKHz = wideLora ? 1625.0f : 500.0f;
+        cr = 5;
+        sf = 7;
+        break;
+    case meshtastic_Config_LoRaConfig_ModemPreset_SHORT_FAST:
+        bwKHz = wideLora ? 812.5f : 250.0f;
+        cr = 5;
+        sf = 7;
+        break;
+    case meshtastic_Config_LoRaConfig_ModemPreset_SHORT_SLOW:
+        bwKHz = wideLora ? 812.5f : 250.0f;
+        cr = 5;
+        sf = 8;
+        break;
+    case meshtastic_Config_LoRaConfig_ModemPreset_MEDIUM_FAST:
+        bwKHz = wideLora ? 812.5f : 250.0f;
+        cr = 5;
+        sf = 9;
+        break;
+    case meshtastic_Config_LoRaConfig_ModemPreset_MEDIUM_SLOW:
+        bwKHz = wideLora ? 812.5f : 250.0f;
+        cr = 5;
+        sf = 10;
+        break;
+    case meshtastic_Config_LoRaConfig_ModemPreset_LONG_TURBO:
+        bwKHz = wideLora ? 1625.0f : 500.0f;
+        cr = 8;
+        sf = 11;
+        break;
+    case meshtastic_Config_LoRaConfig_ModemPreset_LONG_MODERATE:
+        bwKHz = wideLora ? 406.25f : 125.0f;
+        cr = 8;
+        sf = 11;
+        break;
+    case meshtastic_Config_LoRaConfig_ModemPreset_LONG_SLOW:
+        bwKHz = wideLora ? 406.25f : 125.0f;
+        cr = 8;
+        sf = 12;
+        break;
+    default: // LONG_FAST (or illegal)
+        bwKHz = wideLora ? 812.5f : 250.0f;
+        cr = 5;
+        sf = 11;
+        break;
+    }
+}
+
+static inline float modemPresetToBwKHz(meshtastic_Config_LoRaConfig_ModemPreset preset, bool wideLora)
+{
+    float bwKHz = 0;
+    uint8_t sf = 0;
+    uint8_t cr = 0;
+    modemPresetToParams(preset, wideLora, bwKHz, sf, cr);
+    return bwKHz;
+}
\ No newline at end of file
diff --git a/src/mesh/NodeDB.cpp b/src/mesh/NodeDB.cpp
index 375bc76e3..f87fa58b1 100644
--- a/src/mesh/NodeDB.cpp
+++ b/src/mesh/NodeDB.cpp
@@ -13,6 +13,7 @@
 #include "PacketHistory.h"
 #include "PowerFSM.h"
 #include "RTC.h"
+#include "RadioInterface.h"
 #include "Router.h"
 #include "SPILock.h"
 #include "SafeFile.h"
@@ -1297,6 +1298,13 @@ void NodeDB::loadFromDisk()
             LOG_INFO("Loaded saved config version %d", config.version);
         }
     }
+
+    // Coerce LoRa config fields derived from presets while bootstrapping.
+    // Some clients/UI components display bandwidth/spread_factor directly from config even in preset mode.
+    if (config.has_lora && config.lora.use_preset) {
+        RadioInterface::bootstrapLoRaConfigFromPreset(config.lora);
+    }
+
     if (backupSecurity.private_key.size > 0) {
         LOG_DEBUG("Restoring backup of security config");
         config.security = backupSecurity;
diff --git a/src/mesh/RadioInterface.cpp b/src/mesh/RadioInterface.cpp
index aaaca719e..26ef162b9 100644
--- a/src/mesh/RadioInterface.cpp
+++ b/src/mesh/RadioInterface.cpp
@@ -220,6 +220,34 @@ void initRegion()
     myRegion = r;
 }
 
+void RadioInterface::bootstrapLoRaConfigFromPreset(meshtastic_Config_LoRaConfig &loraConfig)
+{
+    if (!loraConfig.use_preset) {
+        return;
+    }
+
+    // Find region info to determine whether "wide" LoRa is permitted (2.4 GHz uses wider bandwidth codes).
+    const RegionInfo *r = regions;
+    for (; r->code != meshtastic_Config_LoRaConfig_RegionCode_UNSET && r->code != loraConfig.region; r++)
+        ;
+
+    const bool regionWideLora = r->wideLora;
+
+    float bwKHz = 0;
+    uint8_t sf = 0;
+    uint8_t cr = 0;
+    modemPresetToParams(loraConfig.modem_preset, regionWideLora, bwKHz, sf, cr);
+
+    // If selected preset requests a bandwidth larger than the region span, fall back to LONG_FAST.
+    if (r->code != meshtastic_Config_LoRaConfig_RegionCode_UNSET && (r->freqEnd - r->freqStart) < (bwKHz / 1000.0f)) {
+        loraConfig.modem_preset = meshtastic_Config_LoRaConfig_ModemPreset_LONG_FAST;
+        modemPresetToParams(loraConfig.modem_preset, regionWideLora, bwKHz, sf, cr);
+    }
+
+    loraConfig.bandwidth = bwKHzToCode(bwKHz);
+    loraConfig.spread_factor = sf;
+}
+
 /**
  * ## LoRaWAN for North America
 
@@ -474,54 +502,7 @@ void RadioInterface::applyModemConfig()
     bool validConfig = false; // We need to check for a valid configuration
     while (!validConfig) {
         if (loraConfig.use_preset) {
-
-            switch (loraConfig.modem_preset) {
-            case meshtastic_Config_LoRaConfig_ModemPreset_SHORT_TURBO:
-                bw = (myRegion->wideLora) ? 1625.0 : 500;
-                cr = 5;
-                sf = 7;
-                break;
-            case meshtastic_Config_LoRaConfig_ModemPreset_SHORT_FAST:
-                bw = (myRegion->wideLora) ? 812.5 : 250;
-                cr = 5;
-                sf = 7;
-                break;
-            case meshtastic_Config_LoRaConfig_ModemPreset_SHORT_SLOW:
-                bw = (myRegion->wideLora) ? 812.5 : 250;
-                cr = 5;
-                sf = 8;
-                break;
-            case meshtastic_Config_LoRaConfig_ModemPreset_MEDIUM_FAST:
-                bw = (myRegion->wideLora) ? 812.5 : 250;
-                cr = 5;
-                sf = 9;
-                break;
-            case meshtastic_Config_LoRaConfig_ModemPreset_MEDIUM_SLOW:
-                bw = (myRegion->wideLora) ? 812.5 : 250;
-                cr = 5;
-                sf = 10;
-                break;
-            case meshtastic_Config_LoRaConfig_ModemPreset_LONG_TURBO:
-                bw = (myRegion->wideLora) ? 1625.0 : 500;
-                cr = 8;
-                sf = 11;
-                break;
-            default: // Config_LoRaConfig_ModemPreset_LONG_FAST is default. Gracefully use this is preset is something illegal.
-                bw = (myRegion->wideLora) ? 812.5 : 250;
-                cr = 5;
-                sf = 11;
-                break;
-            case meshtastic_Config_LoRaConfig_ModemPreset_LONG_MODERATE:
-                bw = (myRegion->wideLora) ? 406.25 : 125;
-                cr = 8;
-                sf = 11;
-                break;
-            case meshtastic_Config_LoRaConfig_ModemPreset_LONG_SLOW:
-                bw = (myRegion->wideLora) ? 406.25 : 125;
-                cr = 8;
-                sf = 12;
-                break;
-            }
+            modemPresetToParams(loraConfig.modem_preset, myRegion->wideLora, bw, sf, cr);
             if (loraConfig.coding_rate >= 5 && loraConfig.coding_rate <= 8 && loraConfig.coding_rate != cr) {
                 cr = loraConfig.coding_rate;
                 LOG_INFO("Using custom Coding Rate %u", cr);
@@ -529,20 +510,7 @@ void RadioInterface::applyModemConfig()
         } else {
             sf = loraConfig.spread_factor;
             cr = loraConfig.coding_rate;
-            bw = loraConfig.bandwidth;
-
-            if (bw == 31) // This parameter is not an integer
-                bw = 31.25;
-            if (bw == 62) // Fix for 62.5Khz bandwidth
-                bw = 62.5;
-            if (bw == 200)
-                bw = 203.125;
-            if (bw == 400)
-                bw = 406.25;
-            if (bw == 800)
-                bw = 812.5;
-            if (bw == 1600)
-                bw = 1625.0;
+            bw = bwCodeToKHz(loraConfig.bandwidth);
         }
 
         if ((myRegion->freqEnd - myRegion->freqStart) < bw / 1000) {
diff --git a/src/mesh/RadioInterface.h b/src/mesh/RadioInterface.h
index 6049a11cc..e4dc02de5 100644
--- a/src/mesh/RadioInterface.h
+++ b/src/mesh/RadioInterface.h
@@ -7,6 +7,9 @@
 #include "airtime.h"
 #include "error.h"
 
+// Forward decl to avoid a direct include of generated config headers / full LoRaConfig definition in this widely-included file.
+typedef struct _meshtastic_Config_LoRaConfig meshtastic_Config_LoRaConfig;
+
 #define MAX_TX_QUEUE 16 // max number of packets which can be waiting for transmission
 
 #define MAX_LORA_PAYLOAD_LEN 255 // max length of 255 per Semtech's datasheets on SX12xx
@@ -115,6 +118,12 @@ class RadioInterface
 
     virtual ~RadioInterface() {}
 
+    /**
+     * Coerce LoRa config fields (bandwidth/spread_factor) derived from presets.
+     * This is used during early bootstrapping so UIs that display these fields directly remain consistent.
+     */
+    static void bootstrapLoRaConfigFromPreset(meshtastic_Config_LoRaConfig &loraConfig);
+
     /**
      * Return true if we think the board can go to sleep (i.e. our tx queue is empty, we are not sending or receiving)
      *
diff --git a/test/test_radio/test_main.cpp b/test/test_radio/test_main.cpp
new file mode 100644
index 000000000..fbe2b1b13
--- /dev/null
+++ b/test/test_radio/test_main.cpp
@@ -0,0 +1,100 @@
+#include "MeshRadio.h"
+#include "RadioInterface.h"
+#include "TestUtil.h"
+#include <unity.h>
+
+#include "meshtastic/config.pb.h"
+
+static void test_bwCodeToKHz_specialMappings()
+{
+    TEST_ASSERT_FLOAT_WITHIN(0.0001f, 31.25f, bwCodeToKHz(31));
+    TEST_ASSERT_FLOAT_WITHIN(0.0001f, 62.5f, bwCodeToKHz(62));
+    TEST_ASSERT_FLOAT_WITHIN(0.0001f, 203.125f, bwCodeToKHz(200));
+    TEST_ASSERT_FLOAT_WITHIN(0.0001f, 406.25f, bwCodeToKHz(400));
+    TEST_ASSERT_FLOAT_WITHIN(0.0001f, 812.5f, bwCodeToKHz(800));
+    TEST_ASSERT_FLOAT_WITHIN(0.0001f, 1625.0f, bwCodeToKHz(1600));
+}
+
+static void test_bwCodeToKHz_passthrough()
+{
+    TEST_ASSERT_FLOAT_WITHIN(0.0001f, 125.0f, bwCodeToKHz(125));
+    TEST_ASSERT_FLOAT_WITHIN(0.0001f, 250.0f, bwCodeToKHz(250));
+}
+
+static void test_bootstrapLoRaConfigFromPreset_noopWhenUsePresetFalse()
+{
+    meshtastic_Config_LoRaConfig cfg = meshtastic_Config_LoRaConfig_init_zero;
+    cfg.use_preset = false;
+    cfg.region = meshtastic_Config_LoRaConfig_RegionCode_US;
+    cfg.modem_preset = meshtastic_Config_LoRaConfig_ModemPreset_MEDIUM_FAST;
+    cfg.bandwidth = 123;
+    cfg.spread_factor = 8;
+
+    RadioInterface::bootstrapLoRaConfigFromPreset(cfg);
+
+    TEST_ASSERT_EQUAL_UINT16(123, cfg.bandwidth);
+    TEST_ASSERT_EQUAL_UINT32(8, cfg.spread_factor);
+    TEST_ASSERT_EQUAL(meshtastic_Config_LoRaConfig_ModemPreset_MEDIUM_FAST, cfg.modem_preset);
+}
+
+static void test_bootstrapLoRaConfigFromPreset_setsDerivedFields_nonWideRegion()
+{
+    meshtastic_Config_LoRaConfig cfg = meshtastic_Config_LoRaConfig_init_zero;
+    cfg.use_preset = true;
+    cfg.region = meshtastic_Config_LoRaConfig_RegionCode_US;
+    cfg.modem_preset = meshtastic_Config_LoRaConfig_ModemPreset_MEDIUM_FAST;
+
+    RadioInterface::bootstrapLoRaConfigFromPreset(cfg);
+
+    TEST_ASSERT_EQUAL_UINT16(250, cfg.bandwidth);
+    TEST_ASSERT_EQUAL_UINT32(9, cfg.spread_factor);
+}
+
+static void test_bootstrapLoRaConfigFromPreset_setsDerivedFields_wideRegion()
+{
+    meshtastic_Config_LoRaConfig cfg = meshtastic_Config_LoRaConfig_init_zero;
+    cfg.use_preset = true;
+    cfg.region = meshtastic_Config_LoRaConfig_RegionCode_LORA_24;
+    cfg.modem_preset = meshtastic_Config_LoRaConfig_ModemPreset_MEDIUM_FAST;
+
+    RadioInterface::bootstrapLoRaConfigFromPreset(cfg);
+
+    TEST_ASSERT_EQUAL_UINT16(800, cfg.bandwidth);
+    TEST_ASSERT_EQUAL_UINT32(9, cfg.spread_factor);
+}
+
+static void test_bootstrapLoRaConfigFromPreset_fallsBackIfBandwidthExceedsRegionSpan()
+{
+    meshtastic_Config_LoRaConfig cfg = meshtastic_Config_LoRaConfig_init_zero;
+    cfg.use_preset = true;
+    cfg.region = meshtastic_Config_LoRaConfig_RegionCode_EU_868;
+    cfg.modem_preset = meshtastic_Config_LoRaConfig_ModemPreset_SHORT_TURBO;
+
+    RadioInterface::bootstrapLoRaConfigFromPreset(cfg);
+
+    TEST_ASSERT_EQUAL(meshtastic_Config_LoRaConfig_ModemPreset_LONG_FAST, cfg.modem_preset);
+    TEST_ASSERT_EQUAL_UINT16(250, cfg.bandwidth);
+    TEST_ASSERT_EQUAL_UINT32(11, cfg.spread_factor);
+}
+
+void setUp(void) {}
+void tearDown(void) {}
+
+void setup()
+{
+    delay(10);
+    delay(2000);
+
+    initializeTestEnvironment();
+
+    UNITY_BEGIN();
+    RUN_TEST(test_bwCodeToKHz_specialMappings);
+    RUN_TEST(test_bwCodeToKHz_passthrough);
+    RUN_TEST(test_bootstrapLoRaConfigFromPreset_noopWhenUsePresetFalse);
+    RUN_TEST(test_bootstrapLoRaConfigFromPreset_setsDerivedFields_nonWideRegion);
+    RUN_TEST(test_bootstrapLoRaConfigFromPreset_setsDerivedFields_wideRegion);
+    RUN_TEST(test_bootstrapLoRaConfigFromPreset_fallsBackIfBandwidthExceedsRegionSpan);
+    exit(UNITY_END());
+}
+
+void loop() {}