diff --git a/x1/injector/disable_mmu.S b/x1/injector/disable_mmu.S
index 39f6318..ec2ea84 100644
--- a/x1/injector/disable_mmu.S
+++ b/x1/injector/disable_mmu.S
@@ -3,10 +3,42 @@
     .global _start
 
 _start:
-    ldr r0, =0x67800000
+//preload U-Boot from sd
+    ldr     r4, .L3
+    adr     r1, [.LC0]
+    adr     r0, [.LC1]
+    mov     r3, r4
+    blx     r3
+    add     r5, r4, #0xc
+    mov     r3, r0
+    ldr     r0, .L3+4
+    mov     r1, #1
+    mov     r2, r0
+    blx     r5
 
     cpsid if
 
+//copy U-Boot to head of RAM 
+    ldr     r3, =0x37500000
+    ldr     r1, =0x37540000
+    .L2:
+    mov     r2, r3
+    sub     r3, r3, #0x7500000
+    ldr     r0, [r2], #4
+    cmp     r2, r1
+    str     r0, [r3]
+    mov     r3, r2
+    bne     .L2
+
+    ldr r0, =0x60000000
+
+//MUB Interrupt Disable
+    ldr r2,=0x40220064
+    ldr r3,[r2]
+    ldr r1,=0x0000ffff
+    and r3,r3,r1
+    str r3,[r2]
+
     mrc p15, 0, r8, c14, c2, 1
     bic r8, r8, #1
     mcr p15, 0, r8, c14, c2, 1
@@ -54,5 +86,12 @@ _start:
     bic r6, r6, #1  @ disable MMU
     mcr p15, 0, r6, c1, c0, 0 // write ctrl regs
 
-    mov pc, r0
+    bx r0
 
+    .L3:
+    .word   0x60006400
+    .word   0x37500000
+    .LC0:
+    .ascii  "r\000"
+    .LC1:
+    .ascii  "SD0:\\u-boot.bin\000"