Button combinations, External UART and Download Mode JIG

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Hey guys, I just received a Focus S from Samsung in error. I just put it through my standard high-level hardware hacking routine.


Download Mode


how to get download mode by button combination

1. Remove the battery
2. Replace the battery
3. Hold Camera + Volume Up + Power

How to get download mode by USB port resistor

1. Remove the battery
2. Replace the battery
3. Connect 301Kohms of resistance between USB Pins 4 and 5 (aka 4 and X).

Format Mode


How to get format mode by button combination

1. Remove the battery
2. Replace the battery
3. Hold Camera + Volume Down + Power

Unknown Boot Mode

1. Remove the battery
2. Replace the battery
3. Connect 619Kohms of resistance between USB Pins 4 and 5 (aka 4 and X).
4. Monitor UART output at 3V, 115200bps, 8n1. RX on USB Pin2 and TX on USB Pin3

Observe the following messages

AST_POWERON                                             
                                                        
BOOTING COMPLETED

Here's what I find interesting... These are the same messages observed on the GalaxyS i9100. Also, this boot mode is apparently not accesible by any other means. It is possible that it is a dedicated dual-boot mode without a kernel. It would be worth researching the partition structures.

Now, if Samsung lets me keep this device, I can see what else I can do. I'd like to probe for the internal UART as well. However, this is as far as I can get without tearing the device apart. I hope this helps in the quest for Android on the Samsung Focus.

I'm sorry about my stupid question.
But what does the Download Mode:::: i really don't know

Originally Posted by CaixaDagua

I'm sorry about my stupid question.
But what does the Download Mode:::: i really don't know

I domt know... samsung asked for the device back. On GalaxyS devices, you use the tool Odin3 to load firmware through download mode.