diff --git a/backend/public/router.py b/backend/public/router.py
index 55d237e..c34f1d6 100644
--- a/backend/public/router.py
+++ b/backend/public/router.py
@@ -123,6 +123,11 @@ class NvsRequest(BaseModel):
     serial_number: str
     hw_type: str
     hw_revision: str
+    nvs_schema: str = "new"  # "legacy" | "new"
+
+    @property
+    def legacy(self) -> bool:
+        return self.nvs_schema == "legacy"
 
 
 @router.post("/cloudflash/nvs.bin")
@@ -149,6 +154,7 @@ async def generate_public_nvs(body: NvsRequest):
             serial_number=sn,
             hw_family=hw_type,
             hw_revision=hw_revision,
+            legacy=body.legacy,
         )
     except Exception as e:
         raise HTTPException(status_code=500, detail=f"NVS generation failed: {str(e)}")
diff --git a/backend/utils/nvs_generator.py b/backend/utils/nvs_generator.py
index b2b72cb..4b7262d 100644
--- a/backend/utils/nvs_generator.py
+++ b/backend/utils/nvs_generator.py
@@ -177,17 +177,16 @@ def _build_page(entries: List[bytes], slot_counts: List[int], seq: int = 0) -> b
     return page
 
 
-def generate(serial_number: str, hw_family: str, hw_revision: str) -> bytes:
+def generate(serial_number: str, hw_family: str, hw_revision: str, legacy: bool = False) -> bytes:
     """Generate a 0x5000-byte NVS partition binary for a Vesper device.
 
     serial_number: full SN string e.g. 'BSVSPR-26C13X-STD01R-X7KQA'
     hw_family: board family e.g. 'vesper-standard', 'vesper-plus'
     hw_revision: hardware revision string e.g. '1.0'
-
-    Writes the schema keys expected by ConfigManager (struct DeviceConfig):
-      serial      ← full serial number
-      hw_family   ← board family (lowercase)
-      hw_revision ← hardware revision string
+    legacy: if True, writes old key names expected by legacy firmware (pre-new-schema):
+              device_uid, hw_type, hw_version
+            if False (default), writes new key names:
+              serial, hw_family, hw_revision
 
     Returns raw bytes ready to flash at 0x9000.
     """
@@ -195,9 +194,14 @@ def generate(serial_number: str, hw_family: str, hw_revision: str) -> bytes:
 
     # Build entries for namespace "device_id"
     ns_entry, ns_span = _build_namespace_entry("device_id", ns_index)
-    uid_entry, uid_span = _build_string_entry(ns_index, "serial",      serial_number)
-    hwt_entry, hwt_span = _build_string_entry(ns_index, "hw_family",   hw_family.lower())
-    hwv_entry, hwv_span = _build_string_entry(ns_index, "hw_revision", hw_revision)
+    if legacy:
+        uid_entry, uid_span = _build_string_entry(ns_index, "device_uid",  serial_number)
+        hwt_entry, hwt_span = _build_string_entry(ns_index, "hw_type",     hw_family.lower())
+        hwv_entry, hwv_span = _build_string_entry(ns_index, "hw_version",  hw_revision)
+    else:
+        uid_entry, uid_span = _build_string_entry(ns_index, "serial",      serial_number)
+        hwt_entry, hwt_span = _build_string_entry(ns_index, "hw_family",   hw_family.lower())
+        hwv_entry, hwv_span = _build_string_entry(ns_index, "hw_revision", hw_revision)
 
     entries = [ns_entry, uid_entry, hwt_entry, hwv_entry]
     spans   = [ns_span,  uid_span,  hwt_span,  hwv_span]
diff --git a/frontend/src/cloudflash/CloudFlashPage.jsx b/frontend/src/cloudflash/CloudFlashPage.jsx
index 13f9c84..8f14757 100644
--- a/frontend/src/cloudflash/CloudFlashPage.jsx
+++ b/frontend/src/cloudflash/CloudFlashPage.jsx
@@ -130,7 +130,7 @@ function ProgressBar({ label, percent }) {
         <span>{label}</span>
         <span>{Math.round(percent)}%</span>
       </div>
-      <div className="h-2 rounded-full overflow-hidden" style={{ backgroundColor: "var(--bg-card-hover)" }}>
+      <div className="h-3 rounded-full overflow-hidden" style={{ backgroundColor: "var(--bg-card-hover)" }}>
         <div
           className="h-full rounded-full transition-all duration-200"
           style={{ width: `${percent}%`, backgroundColor: "var(--accent)" }}
@@ -140,6 +140,32 @@ function ProgressBar({ label, percent }) {
   );
 }
 
+function CombinedProgressBar({ blPct, partPct, nvsPct, fwPct }) {
+  // Weights: bl=10%, part=10%, nvs=10%, fw=70%
+  const overall = blPct * 0.10 + partPct * 0.10 + nvsPct * 0.10 + fwPct * 0.70;
+
+  const label =
+    fwPct > 0    ? `Firmware (${Math.round(fwPct)}%)`       :
+    nvsPct > 0   ? `Device Identity (${Math.round(nvsPct)}%)` :
+    partPct > 0  ? `Partition Table (${Math.round(partPct)}%)` :
+                   `Bootloader (${Math.round(blPct)}%)`;
+
+  return (
+    <div className="space-y-1.5">
+      <div className="flex justify-between text-xs" style={{ color: "var(--text-secondary)" }}>
+        <span>{label}</span>
+        <span>{Math.round(overall)}%</span>
+      </div>
+      <div className="h-3 rounded-full overflow-hidden" style={{ backgroundColor: "var(--bg-card-hover)" }}>
+        <div
+          className="h-full rounded-full transition-all duration-200"
+          style={{ width: `${overall}%`, backgroundColor: "var(--accent)" }}
+        />
+      </div>
+    </div>
+  );
+}
+
 function InfoBox({ type = "info", children }) {
   const styles = {
     info:    { bg: "var(--badge-blue-bg)",  border: "#1e3a5f",  color: "var(--badge-blue-text)" },
@@ -858,17 +884,13 @@ function StepFlash({ firmware, flashType, serial, nvsSchema, onDone }) {
         </div>
       )}
 
-      {/* Progress bars */}
+      {/* Progress bar */}
       {(flashing || fwPct > 0) && (
-        <div className="space-y-3 mb-4">
-          {isFullWipe && (
-            <>
-              <ProgressBar label="Bootloader" percent={blPct} />
-              <ProgressBar label="Partition Table" percent={partPct} />
-              <ProgressBar label="Device Identity (NVS)" percent={nvsPct} />
-            </>
-          )}
-          <ProgressBar label="Firmware" percent={fwPct} />
+        <div className="mb-4">
+          {isFullWipe
+            ? <CombinedProgressBar blPct={blPct} partPct={partPct} nvsPct={nvsPct} fwPct={fwPct} />
+            : <ProgressBar label="Firmware" percent={fwPct} />
+          }
         </div>
       )}