It is not different. Did you read the Wiki?

Revision A5C (Production Version)

Production had some fallout of boards when running the HDMI tests in the
previous production run. Resistor values were tweaked to improve the test
results.
No changes in features or operation of the board.
1) Changed R46,R47,R48 to a 0 ohm.
2) Changed R45 to a 22 Ohm.
Revision A5B (Previous Production Version)

1) Updated the PCB to incorporate the modification that was being done on
Rev A5A. There is NO DIFFERENCE AT ALL in functionality between REV A5A and
REV A5B.
2) Made the LEDs dimmer for those that could not sleep due to the
brightness of the LEDs.
Revision A5A (Old Production Version)

1) Boards are built using the XAM3359AZCZ100 processor.
2) PCB Change...LCD noise issue was resolved by adding 47pf bypass caps on
some of the LCD signals.
3) PCB Change...Added access to four battery charger signals on the
TPS65217 (TS=Temperature Sense, BAT=Battery connection,BATT_SENSE=Battery
voltage pin, GND=Ground). Pins are not populated but the four signals are
in a 2x2 .1x.1 spacing.
4) PCB Change...Added a power button which allows for wake up, power down,
and sleep options. It also provides the ability to alert the processor
before powering down to provide an orderly shutdown. It is expected that SW
will be used in conjunction with the switch to control the various power
modes and transitions from one to the other. By holding the button down for
8 seconds, it will force a power down of the board.
5) Added a 100K pull down resistor from J1 pin 1 to J1 pin 4 to fix the
unterminated serial port issue.

Gerald


On Fri, Oct 4, 2013 at 10:51 AM, <[email protected]> wrote:

>
>
>> "bone20" Yuck... Why do people still use an image that hasn't seen any
>> updates since June 9th..
>>
>>
>> Was June when i started working on this "beautiful" board, and now from i
> understood there isnt a way to make any in place upgrate, i cannot reflash
> and starting all again...
>
> Could you answer to my question, please?
>
> --->>> Why the hardware is different? <<<---
>
> --
> For more options, visit http://beagleboard.org/discuss
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