diff --git a/emulators/azahar.yml b/emulators/azahar.yml
index 9b41722f..ff55d820 100644
--- a/emulators/azahar.yml
+++ b/emulators/azahar.yml
@@ -59,6 +59,7 @@ files:
     path: sysdata/otp.bin
     system: nintendo-3ds
     required: false
+    size: 256
     validation: [size, crypto]
     note: "OTP data for console key derivation"
     source_ref: "src/core/hw/unique_data.cpp:126-167, src/core/hw/unique_data.cpp:213"
@@ -67,6 +68,7 @@ files:
     path: nand/private/movable.sed
     system: nintendo-3ds
     required: false
+    size: 320
     validation: [size, signature]
     note: "console-unique key seed"
     source_ref: "src/core/hw/unique_data.cpp:170-200, src/core/hw/unique_data.cpp:217"
@@ -75,6 +77,7 @@ files:
     path: nand/rw/sys/SecureInfo_A
     system: nintendo-3ds
     required: false
+    size: 273
     validation: [size, signature]
     note: "console serial and region data"
     source_ref: "src/core/hw/unique_data.cpp:43-92, src/core/hw/unique_data.cpp:205"
@@ -83,6 +86,7 @@ files:
     path: nand/rw/sys/LocalFriendCodeSeed_B
     system: nintendo-3ds
     required: false
+    size: 284
     validation: [size, signature]
     note: "friend code generation seed"
     source_ref: "src/core/hw/unique_data.cpp:94-123, src/core/hw/unique_data.cpp:209"
diff --git a/emulators/citra.yml b/emulators/citra.yml
index 39fcf4cb..d5f548bd 100644
--- a/emulators/citra.yml
+++ b/emulators/citra.yml
@@ -35,9 +35,10 @@ files:
     system: nintendo-3ds
     description: "ARM9 bootrom"
     required: false
+    size: 65536
     validation: [size]
     source_ref: "src/core/hw/aes/key.cpp:162-172 LoadBootromKeys(), src/core/hw/rsa/rsa.cpp:55-65 InitSlots()"
-    note: "expected size 65536 bytes, provides AES and RSA keys"
+    note: "provides AES and RSA keys"
 
   - name: shared_font.bin
     path: "Citra/sysdata/shared_font.bin"
diff --git a/emulators/directxbox.yml b/emulators/directxbox.yml
index 07a96570..6219de90 100644
--- a/emulators/directxbox.yml
+++ b/emulators/directxbox.yml
@@ -53,6 +53,7 @@ files:
 
   - name: "cromwell_1024.bin"
     path: "cromwell_1024.bin"
+    size: 1048576
     validation: [size]
     required: true
     note: >
diff --git a/emulators/melonds.yml b/emulators/melonds.yml
index f831a241..f3281d18 100644
--- a/emulators/melonds.yml
+++ b/emulators/melonds.yml
@@ -24,7 +24,7 @@ files:
     hle_fallback: true
     size: 4096
     validation: {core: [size], upstream: [size, crc32]}
-    crc32: "0x2ab23573"
+    crc32: 2ab23573
     source_ref: "src/NDS.h:196, src/NDS.cpp:467-477, src/frontend/Util_ROM.cpp:99-111"
     note: "FreeBIOS fallback (src/FreeBIOS.h); native needed for Key1 cartridge crypto"
 
@@ -35,7 +35,7 @@ files:
     hle_fallback: true
     size: 16384
     validation: {core: [size], upstream: [size, crc32]}
-    crc32: "0x1280f0d5"
+    crc32: 1280f0d5
     source_ref: "src/NDS.h:197, src/NDS.cpp:482-492, src/frontend/Util_ROM.cpp:117-131"
     note: "FreeBIOS fallback (src/FreeBIOS.h); native needed for Key1 init at offset 0x0030"
 
@@ -44,6 +44,8 @@ files:
     description: "NDS firmware image"
     required: false
     hle_fallback: true
+    min_size: 262144
+    max_size: 524288
     validation: [size]
     source_ref: "src/SPI.cpp:192-211, src/frontend/Util_ROM.cpp:174-195"
     note: "Generated 128KB firmware as fallback; native must be 256KB or 512KB for boot"
@@ -55,7 +57,7 @@ files:
     required: true
     size: 65536
     validation: {core: [size], upstream: [size, crc32]}
-    crc32: "0xBAE84F6C"
+    crc32: bae84f6c
     source_ref: "src/DSi.h:33, src/DSi.cpp:587-599, src/frontend/Util_ROM.cpp:145-156"
 
   - name: dsi_bios7.bin
@@ -64,7 +66,7 @@ files:
     required: true
     size: 65536
     validation: {core: [size], upstream: [size, crc32]}
-    crc32: "0x4316CC42"
+    crc32: 4316cc42
     source_ref: "src/DSi.h:34, src/DSi.cpp:604-620, src/frontend/Util_ROM.cpp:158-170"
     note: "Contains eMMC key-Y at offset 0x8308 for NAND init"
 
diff --git a/emulators/melonds_ds.yml b/emulators/melonds_ds.yml
index aa6385d4..8697a5c2 100644
--- a/emulators/melonds_ds.yml
+++ b/emulators/melonds_ds.yml
@@ -27,7 +27,7 @@ files:
     hle_fallback: true
     size: 16384
     validation: [size]
-    crc32: "0x1280f0d5"
+    crc32: 1280f0d5
     source_ref: "src/libretro/config/console.cpp:219, melonDS:src/MemConstants.h:31,36"
 
   - name: bios9.bin
@@ -37,7 +37,7 @@ files:
     hle_fallback: true
     size: 4096
     validation: [size]
-    crc32: "0x2ab23573"
+    crc32: 2ab23573
     source_ref: "src/libretro/config/console.cpp:220, melonDS:src/MemConstants.h:30,37"
 
   - name: firmware.bin
@@ -55,7 +55,7 @@ files:
     required: true
     size: 65536
     validation: [size]
-    crc32: "0x4316CC42"
+    crc32: 4316cc42
     source_ref: "src/libretro/config/console.cpp:333, melonDS:src/MemConstants.h:32,44"
     note: "Contains eMMC key-Y at offset 0x8308 for NAND init"
 
@@ -65,7 +65,7 @@ files:
     required: true
     size: 65536
     validation: [size]
-    crc32: "0xBAE84F6C"
+    crc32: bae84f6c
     source_ref: "src/libretro/config/console.cpp:338, melonDS:src/MemConstants.h:32,45"
 
   - name: dsi_firmware.bin
diff --git a/emulators/mesen.yml b/emulators/mesen.yml
index 8271ec85..ea0183ce 100644
--- a/emulators/mesen.yml
+++ b/emulators/mesen.yml
@@ -65,5 +65,7 @@ files:
     description: "External NES color palette"
     required: false
     source_ref: "Libretro/libretro.cpp:301-323 (load_custom_palette), Libretro/libretro.cpp:405-406 (called when mesen_palette == Custom)"
+    min_size: 192
+    max_size: 1536
     validation: [size]
-    note: "Loaded when mesen_palette core option is Custom. Accepts exactly 192 bytes (64 RGB triplets) or 1536 bytes (512 entries for emphasis combos). Falls back to built-in default palette if size doesn't match."
+    note: "Accepts 192 bytes (64 RGB triplets) or 1536 bytes (512 emphasis combos). Falls back to built-in default if size doesn't match."