diff --git a/lib/I18n/I18nKeys.h b/lib/I18n/I18nKeys.h
index 956b8ee4..aad6c695 100644
--- a/lib/I18n/I18nKeys.h
+++ b/lib/I18n/I18nKeys.h
@@ -351,6 +351,9 @@ enum class StrId : uint16_t {
   STR_OVERLAY_GRAY,
   STR_OVERLAY_BLACK,
   STR_OVERLAY_OFF,
+  STR_OVERLAY_READING_PROGRESS,
+  STR_OVERLAY_READING_PROGRESS_NO_TOTAL,
+  STR_OVERLAY_CHAPTER_PAGE_SUFFIX,
   // Sentinel - must be last
   _COUNT
 };
@@ -405,8 +408,7 @@ inline const char* const* getStringArray(Language lang) {
 constexpr uint8_t getLanguageCount() { return static_cast<uint8_t>(Language::_COUNT); }
 
 // Sorted language indices by code (auto-generated by gen_i18n.py)
-// Order: English, Беларуская, Català, Čeština, Dansk, Deutsch, Español, Suomi, Français, Italiano, Қазақша, Nederlands,
-// Polski, Português (Brasil), Română, Русский, Svenska, Türkçe, Українська
+// Order: English, Беларуская, Català, Čeština, Dansk, Deutsch, Español, Suomi, Français, Italiano, Қазақша, Nederlands, Polski, Português (Brasil), Română, Русский, Svenska, Türkçe, Українська
 constexpr uint8_t SORTED_LANGUAGE_INDICES[] = {0, 11, 9, 4, 15, 3, 1, 14, 2, 12, 18, 16, 13, 5, 8, 6, 7, 17, 10};
 
 static_assert(sizeof(SORTED_LANGUAGE_INDICES) / sizeof(SORTED_LANGUAGE_INDICES[0]) == getLanguageCount(),
diff --git a/lib/I18n/I18nStrings.cpp b/lib/I18n/I18nStrings.cpp
index afec9519..3274459d 100644
--- a/lib/I18n/I18nStrings.cpp
+++ b/lib/I18n/I18nStrings.cpp
@@ -137,7 +137,7 @@ const char* const CHARACTER_SETS[] = {
     "\xC3"
     "\xBA"
     "",  // Español
-    " !%'()*+,./012345:=?ABCDEFGHIJKLMNOPQRSTUVW[]abcdefghijklmnopqrstuvwxyz|\xC2"
+    " !%'()*+,-./012345:=?ABCDEFGHIJKLMNOPQRSTUVW[]abcdefghijklmnopqrstuvwxyz|\xC2"
     "\xAB"
     "\xC3"
     "\x89"
@@ -185,7 +185,7 @@ const char* const CHARACTER_SETS[] = {
     "\x80"
     "\xA6"
     "",  // Deutsch
-    " !%()*+,./012345:=?ABCDEFGHIJKLMNOPQRSTUVWYZ[]abcdefghijklmnoprstuvwxyz|\xC2"
+    " !%()*+,-./012345:=?ABCDEFGHIJKLMNOPQRSTUVWYZ[]abcdefghijklmnoprstuvwxyz|\xC2"
     "\xAB"
     "\xC3"
     "\x81"
@@ -758,7 +758,7 @@ const char* const CHARACTER_SETS[] = {
     "\xC3"
     "\xBC"
     "",  // Nederlands
-    " !\"%'()*+,./012345:=?ABCDEFGHIKLMNOPQRSTUVWYZ[]abcdefghiklmnoprstuvwxyz|\xC2"
+    " !\"%'()*+,-./012345:=?ABCDEFGHIKLMNOPQRSTUVWYZ[]abcdefghiklmnoprstuvwxyz|\xC2"
     "\xAB"
     "\xC3"
     "\x87"
@@ -781,7 +781,7 @@ const char* const CHARACTER_SETS[] = {
     "\xC5"
     "\x9F"
     "",  // Türkçe
-    " !\"%()*+,-./012345:=?ABCDFGHIKLMNOPQRSUW[]abcdefhiklnoprstuvwxyz|\xC2"
+    " !\"%()*+,-./012345:=?ABCDFGHIKLMNOPQRSUW[]abcdefghiklnoprstuvwxyz|\xC2"
     "\xAB"
     "\xD0"
     "\x86"
@@ -1214,6 +1214,9 @@ const char* const STRINGS_EN[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_ES[] = {
@@ -1746,6 +1749,9 @@ const char* const STRINGS_ES[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_FR[] = {
@@ -2382,6 +2388,9 @@ const char* const STRINGS_FR[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_DE[] = {
@@ -2826,6 +2835,9 @@ const char* const STRINGS_DE[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_CS[] = {
@@ -4187,6 +4199,9 @@ const char* const STRINGS_CS[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_PO[] = {
@@ -4753,6 +4768,9 @@ const char* const STRINGS_PO[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_RU[] = {
@@ -11975,6 +11993,9 @@ const char* const STRINGS_RU[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_SV[] = {
@@ -12700,6 +12721,9 @@ const char* const STRINGS_SV[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_RO[] = {
@@ -13554,6 +13578,9 @@ const char* const STRINGS_RO[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_CA[] = {
@@ -14138,6 +14165,9 @@ const char* const STRINGS_CA[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_UK[] = {
@@ -22374,6 +22404,9 @@ const char* const STRINGS_UK[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_BE[] = {
@@ -29284,6 +29317,9 @@ const char* const STRINGS_BE[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_IT[] = {
@@ -29622,6 +29658,9 @@ const char* const STRINGS_IT[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_PL[] = {
@@ -30498,6 +30537,9 @@ const char* const STRINGS_PL[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_FI[] = {
@@ -31192,6 +31234,9 @@ const char* const STRINGS_FI[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_DA[] = {
@@ -31684,6 +31729,9 @@ const char* const STRINGS_DA[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_NL[] = {
@@ -31992,6 +32040,9 @@ const char* const STRINGS_NL[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_TR[] = {
@@ -33176,6 +33227,9 @@ const char* const STRINGS_TR[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 const char* const STRINGS_KK[] = {
@@ -40892,6 +40946,9 @@ const char* const STRINGS_KK[] = {
     "Gray",
     "Black",
     "Off",
+    "Reading progress: Page %lu/%u - %.0f%%",
+    "Reading progress: Page %lu",
+    " - Page %d/%d - %.0f%%",
 };
 
 }  // namespace i18n_strings
diff --git a/lib/I18n/translations/english.yaml b/lib/I18n/translations/english.yaml
index eb49b310..6b7ea7a5 100644
--- a/lib/I18n/translations/english.yaml
+++ b/lib/I18n/translations/english.yaml
@@ -295,3 +295,6 @@ STR_OVERLAY_WHITE: "White"
 STR_OVERLAY_GRAY: "Gray"
 STR_OVERLAY_BLACK: "Black"
 STR_OVERLAY_OFF: "Off"
+STR_OVERLAY_READING_PROGRESS: "Reading progress: Page %lu/%u - %.0f%%"
+STR_OVERLAY_READING_PROGRESS_NO_TOTAL: "Reading progress: Page %lu"
+STR_OVERLAY_CHAPTER_PAGE_SUFFIX: " - Page %d/%d - %.0f%%"
diff --git a/src/JsonSettingsIO.cpp b/src/JsonSettingsIO.cpp
index a0458043..16ef0f1c 100644
--- a/src/JsonSettingsIO.cpp
+++ b/src/JsonSettingsIO.cpp
@@ -143,6 +143,19 @@ bool JsonSettingsIO::loadSettings(CrossPointSettings& s, const char* json, bool*
     applyLegacyStatusBarSettings(s);
   }
 
+  // Legacy migration: sleepCoverOverlay was a Toggle (0=off, 1=on). Now it's a 4-way Enum:
+  // {WHITE(0), GRAY(1), BLACK(2), OFF(3)}. Translate old values before the generic loop clamps.
+  if (!doc["sleepCoverOverlay"].isNull()) {
+    uint8_t legacyOverlay = doc["sleepCoverOverlay"] | (uint8_t)0;
+    if (legacyOverlay == 0) {
+      s.sleepCoverOverlay = 3;  // OFF
+      doc["sleepCoverOverlay"] = 3;
+      if (needsResave) *needsResave = true;
+    } else if (legacyOverlay == 1) {
+      s.sleepCoverOverlay = 1;  // GRAY (old "on" = gray dither)
+    }
+  }
+
   for (const auto& info : getSettingsList()) {
     if (!info.key) continue;
     // Dynamic entries (KOReader etc.) are stored in their own files — skip.
diff --git a/src/activities/boot_sleep/SleepActivity.cpp b/src/activities/boot_sleep/SleepActivity.cpp
index ff8db6f8..8f4b52d6 100644
--- a/src/activities/boot_sleep/SleepActivity.cpp
+++ b/src/activities/boot_sleep/SleepActivity.cpp
@@ -5,6 +5,7 @@
 #include <GfxRenderer.h>
 #include <HalStorage.h>
 #include <I18n.h>
+#include <Serialization.h>
 #include <Txt.h>
 #include <Xtc.h>
 
@@ -155,8 +156,8 @@ BookOverlayInfo SleepActivity::getBookOverlayInfo(const std::string& bookPath) c
           uint32_t totalPages = xtc.getPageCount();
           float progress = xtc.calculateProgress(currentPage) * 100.0f;
           char buf[64];
-          snprintf(buf, sizeof(buf), "Reading progress: Page %lu/%u - %.0f%%", (unsigned long)currentPage + 1,
-                   totalPages, progress);
+          snprintf(buf, sizeof(buf), tr(STR_OVERLAY_READING_PROGRESS), (unsigned long)currentPage + 1, totalPages,
+                   progress);
           info.progressText = buf;
         }
         f.close();
@@ -176,8 +177,15 @@ BookOverlayInfo SleepActivity::getBookOverlayInfo(const std::string& bookPath) c
           uint32_t totalPages = 0;
           FsFile indexFile;
           if (Storage.openFileForRead("SLP", txt.getCachePath() + "/index.bin", indexFile)) {
-            indexFile.seek(32);
-            if (indexFile.read(reinterpret_cast<uint8_t*>(&totalPages), sizeof(totalPages)) == sizeof(totalPages)) {
+            uint32_t magic;
+            serialization::readPod(indexFile, magic);
+            uint8_t version;
+            serialization::readPod(indexFile, version);
+            static constexpr uint32_t INDEX_CACHE_MAGIC = 0x54585449;  // "TXTI"
+            static constexpr uint8_t INDEX_CACHE_VERSION = 2;
+            if (magic == INDEX_CACHE_MAGIC && version == INDEX_CACHE_VERSION) {
+              indexFile.seek(32);
+              serialization::readPod(indexFile, totalPages);
             }
             indexFile.close();
           }
@@ -185,12 +193,12 @@ BookOverlayInfo SleepActivity::getBookOverlayInfo(const std::string& bookPath) c
           if (totalPages > 0) {
             float progress = (currentPage + 1) * 100.0f / totalPages;
             char buf[64];
-            snprintf(buf, sizeof(buf), "Reading progress: Page %lu/%u - %.0f%%", (unsigned long)currentPage + 1,
-                     totalPages, progress);
+            snprintf(buf, sizeof(buf), tr(STR_OVERLAY_READING_PROGRESS), (unsigned long)currentPage + 1, totalPages,
+                     progress);
             info.progressText = buf;
           } else {
             char buf[64];
-            snprintf(buf, sizeof(buf), "Reading progress: Page %lu", (unsigned long)currentPage + 1);
+            snprintf(buf, sizeof(buf), tr(STR_OVERLAY_READING_PROGRESS_NO_TOTAL), (unsigned long)currentPage + 1);
             info.progressText = buf;
           }
         }
@@ -219,13 +227,14 @@ BookOverlayInfo SleepActivity::getBookOverlayInfo(const std::string& bookPath) c
               const auto tocItem = epub.getTocItem(tocIndex);
               info.chapterName = tocItem.title;
               char suffix[64];
-              snprintf(suffix, sizeof(suffix), " - Page %d/%d - %.0f%%", currentPage + 1, pageCount, bookProgress);
+              snprintf(suffix, sizeof(suffix), tr(STR_OVERLAY_CHAPTER_PAGE_SUFFIX), currentPage + 1, pageCount,
+                       bookProgress);
               info.progressSuffix = suffix;
-              info.progressText = "Chapter: " + info.chapterName + info.progressSuffix;
+              info.progressText = std::string(tr(STR_CHAPTER_PREFIX)) + info.chapterName + info.progressSuffix;
             } else {
               char buf[80];
-              snprintf(buf, sizeof(buf), "Reading progress: Page %d/%d - %.0f%%", currentPage + 1, pageCount,
-                       bookProgress);
+              snprintf(buf, sizeof(buf), tr(STR_OVERLAY_READING_PROGRESS), (unsigned long)currentPage + 1,
+                       (unsigned)pageCount, bookProgress);
               info.progressText = buf;
             }
           }
@@ -341,7 +350,7 @@ void SleepActivity::renderBitmapSleepScreen(const Bitmap& bitmap) const {
     if (hasProgress) {
       std::string progressStr;
       if (!overlayInfo.chapterName.empty()) {
-        const std::string prefix = "Chapter: ";
+        const std::string prefix = tr(STR_CHAPTER_PREFIX);
         const int prefixWidth = renderer.getTextWidth(UI_10_FONT_ID, prefix.c_str());
         const int suffixWidth = renderer.getTextWidth(UI_10_FONT_ID, overlayInfo.progressSuffix.c_str());
         const int maxChapterWidth = availableWidth - prefixWidth - suffixWidth;