diff --git a/emulators/desmume.yml b/emulators/desmume.yml
index 9fd3ebc3..4547985f 100644
--- a/emulators/desmume.yml
+++ b/emulators/desmume.yml
@@ -1,23 +1,19 @@
 emulator: DeSmuME
 type: libretro
+core_classification: community_fork
 source: "https://github.com/libretro/desmume"
-profiled_date: "2026-03-18"
+upstream: "https://github.com/TASEmulators/desmume"
+profiled_date: "2026-03-23"
 core_version: "SVN"
 display_name: "Nintendo - DS (DeSmuME)"
 cores: [desmume]
 systems: [nintendo-ds]
 
 notes: |
-  DeSmuME provides full HLE (High-Level Emulation) of all ARM7/ARM9 SWI
-  routines, making BIOS files optional for most games. When external BIOS
-  is disabled, a minimal fake BIOS with exception vectors and IRQ handler
-  stubs is generated at runtime (NDSSystem.cpp:2208-2224, 2263-2278).
-  External BIOS enables SWI-from-BIOS mode and firmware boot animation.
-  Firmware boot requires both ARM7+ARM9 BIOS loaded AND interpreter mode
-  (JIT incompatible, see libretro.cpp:788).
-  ARM9 BIOS read size: 4096 bytes (0x1000). ARM7 BIOS read size: 16384
-  bytes (0x4000). No DSi support.
-  Libretro core option: desmume_use_external_bios (enabled/disabled).
+  Full HLE of ARM7/ARM9 SWI routines; BIOS files optional for most games.
+  External BIOS enables SWI-from-BIOS mode. Firmware boot requires both
+  BIOS files loaded and interpreter mode (JIT incompatible).
+  No DSi support. Core option: desmume_use_external_bios.
 
 files:
   - name: "bios7.bin"
@@ -26,8 +22,9 @@ files:
     required: false
     hle_fallback: true
     size: 16384
+    validation: [size]
     source_ref: "desmume/src/NDSSystem.cpp:2178-2182, frontend/libretro/libretro.cpp:763"
-    notes: "HLE fallback covers all SWI calls; native file needed for firmware boot and SWI-from-BIOS accuracy"
+    notes: "Native file needed for firmware boot and SWI-from-BIOS accuracy"
 
   - name: "bios9.bin"
     system: nintendo-ds
@@ -35,13 +32,14 @@ files:
     required: false
     hle_fallback: true
     size: 4096
+    validation: [size]
     source_ref: "desmume/src/NDSSystem.cpp:2236-2239, frontend/libretro/libretro.cpp:764"
-    notes: "HLE fallback covers all SWI calls; native file needed for firmware boot and logo comparison (Pal Park)"
+    notes: "Native file needed for firmware boot and logo comparison (Pal Park)"
 
   - name: "firmware.bin"
     system: nintendo-ds
     description: "NDS firmware image"
     required: false
     hle_fallback: true
-    source_ref: "desmume/src/NDSSystem.cpp:2653-2655, frontend/libretro/libretro.cpp:765"
-    notes: "Dummy firmware generated when absent; native firmware needed for boot animation, wifi config, user settings"
+    source_ref: "desmume/src/firmware.cpp:249-280, frontend/libretro/libretro.cpp:765"
+    notes: "Loaded only if both BIOS files present; needed for boot animation, wifi config, user settings"