diff --git a/src/stub/l_armpet.S b/src/stub/l_armpet.S
index 22a96737..5b2dc502 100644
--- a/src/stub/l_armpet.S
+++ b/src/stub/l_armpet.S
@@ -113,11 +113,11 @@ SECT(Unfilter_0x50):
         cmp     buffer, bufend
         beq     .Luf50_ret
 
-        ldrb    r3, [buffer, #3]
-        and     r3, r5
-        cmp     r3, #0x0b
-        bne     .Luf50_1
         ldr     r3, [buffer]
+        lsr     r1, r3, #24
+        and     r1, r5
+        cmp     r1, #0x0b
+        bne     .Luf50_1
         mov     r1, r3
         and     r1, r6
         sub     r3, addval
diff --git a/src/stub/l_armpet.h b/src/stub/l_armpet.h
index 867e85f5..a717f4e0 100644
--- a/src/stub/l_armpet.h
+++ b/src/stub/l_armpet.h
@@ -28,8 +28,8 @@
 
 
 #define NRV_LOADER_THUMB_SIZE    1000
-#define NRV_LOADER_THUMB_ADLER32 0x0e284d57
-#define NRV_LOADER_THUMB_CRC32   0x14427d32
+#define NRV_LOADER_THUMB_ADLER32 0x4f344c3e
+#define NRV_LOADER_THUMB_CRC32   0xe1803a67
 
 unsigned char nrv_loader_thumb[1000] = {
   1,  0, 81,227, 11,  0,  0, 26,255, 79, 45,233, 44, 48,143,226,   /* 0x   0 */
@@ -39,8 +39,8 @@ unsigned char nrv_loader_thumb[1000] = {
  83, 82, 67, 48, 83, 82, 67, 76, 68, 83, 84, 48, 68, 83, 84, 76,   /* 0x  40 */
  73, 65, 84, 84,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,   /* 0x  50 */
  69, 78, 84, 82,  7,203,145, 70,100, 70, 16,181, 11, 72,  0, 34,   /* 0x  60 */
- 11, 76, 15, 37,255, 38, 54,  6,247, 67,160, 66, 18,208,195,120,   /* 0x  70 */
- 43, 64, 11, 43,  6,209,  3,104, 25, 28, 49, 64,155, 26, 59, 64,   /* 0x  80 */
+ 11, 76, 15, 37,255, 38, 54,  6,247, 67,160, 66, 18,208,  3,104,   /* 0x  70 */
+ 25, 14, 41, 64, 11, 41,  5,209, 25, 28, 49, 64,155, 26, 59, 64,   /* 0x  80 */
  11, 67,  3, 96,  4, 48,  1, 50,239,231,  0,  0, 70, 73, 66, 83,   /* 0x  90 */
  70, 73, 66, 69, 14, 72, 74, 70, 17, 31,  3,120,  1, 48,  0, 43,   /* 0x  a0 */
  24,208,240, 43,  8,211, 15, 36, 28, 64, 67,120, 36,  2,228, 24,   /* 0x  b0 */