LED blinking is just like morse : 1 = blink 0 = off
Below is list of meaning of red light pattern.
1 1 Not a bootrom error: the OS is resetting during init!
3 11 No OS Loaded (*Tip: reload MFI)
5 101 Bad OS CRC
7 111 Missing OS CRC
11 1011 Missing OS Trailer
13 1101 OS Not Signed
15 1111 OS Signature Invalid (*Tip: verify failure by loading software and let sit with no battery for approximately one hour, if it boots up it�s fine; if it comes back with another BootRom Error, try replacing the flash)
21 10101 Unknown Flash Manufacturer
23 10111 Flash Initialization Problem (*Tip: try replacing flash)
27 11011 Flash Erase Failure (*Tip: try replacing flash)
29 11101 Flash Operation Out Of Range
31 11111 Bad Bootrom CRC (*Tip: try replacing flash)
43 101011 USB Driver Error
45 101101 No Bootrom CRC
47 101111 Flash Write Failure (*Tip: try replacing flash)
53 110101 Invalid Memory Configuration Table
55 110111 Password Not Initiated
59 111011 RAM Initialization Problem (*Tip: try replacing flash)
61 111101 Cache No Pages Free
63 111111 Cache Invalid Page Type
85 1010101 Random Number Failure
87 1010111 OSStore Failure
91 1011011 Security Init Failure
93 1011101 NAND failure
95 1011111 General Assert Failure
107 1101011 GPIO failure
109 1101101 Runtime library failure
111 1101111 Exception: undefined isntruction
117 1110101 Exception: SWI
119 1110111 Exception: Prefetch Abor
123 1111011 Exception: Data Abort
125 1111101 Exception: Reserved
127 1111111 Exception: IRQ
171 10101011 Exception: FIQ
