Mods for Garmin 55

[lacibaci]

Any mods to improve bit rate on Garmin 55?
CPU: Ambarella A12A55 SOC
Image sensor: OV4689

 

[Falsificator]

Firmware link?

 

[lacibaci]

Firmware link?

http://gawisp.com/perry/dashcam/

 

[Falsificator]

Unzip the script into the root of the card and start recording the video.
Then check if there are any changes in 1080 and 1080HDR modes.
Check for version 3.70...

 

[lacibaci]

Unzip the script into the root of the card and start recording the video.
Then check if there are any changes in 1080 and 1080HDR modes.
Check for version 3.70...

No difference Both modes are about 9Mbps with and without autoexec.

 

[Falsificator]

Scripts may not be supported.
I can change the settings in the firmware, but I can not risk the failure of the
camera after reflashing. Ideally, you would have an ELF to restore the camera...

Try this script now:

GETINFO script by nutsey (GoPrawn.com).
This script is for getting detailed information about Ambarella A12 SoC based cams.

1. Put autoexec.ash to the root of your memory card.
2. Start your action cam with this card inserted.
3. Wait ~15 seconds and turn the camera off.
4. Check the memory card for the LOG.TXT file.
5. Remove/rename autoexec.ash to disable it from running.

Please share your LOG.TXT file and your camera details.

 

[lacibaci]

Here is the log I did some time ago.

 

[Falsificator]

This is strange, but the script in fact should have worked...
It is risky to reflash with a modified firmware without having an ELF on your hands.
Upload short video originals at various resolutions or give media information (MediaInfo).

 

[lacibaci]

Here is a couple, one day, the other at night. Both straight out of camera.
https://mega.nz/#F!5poAEBJT!JNBB1DAmd720q60VndB6rw

Thanks

 

[Falsificator]

Try again...

GARMIN DashCam 55 v3.70 - 36Mbit TEST
#=================================================
#2.5.6.0.x.1.4.4.0. .3.0.P
writew 0xA07E7379 0x4210
writew 0xA07E7389 0x4210
#=================================================
#2.5.6.0.x.1.4.4.0. .3.0.P.H.D.R
writew 0xA07E7481 0x4210
#=================================================
#1.9.2.0.x.1.0.8.0. .3.0.P
writew 0xA07E7B29 0x4210
#=================================================
#1.9.2.0.x.1.0.8.0. .3.0.P.H.D.R
writew 0xA07E7C21 0x4210
#=================================================

 

[lacibaci]

Try again...

GARMIN DashCam 55 v3.70 - 36Mbit TEST
#=================================================
#2.5.6.0.x.1.4.4.0. .3.0.P
writew 0xA07E7379 0x4210
writew 0xA07E7389 0x4210
#=================================================
#2.5.6.0.x.1.4.4.0. .3.0.P.H.D.R
writew 0xA07E7481 0x4210
#=================================================
#1.9.2.0.x.1.0.8.0. .3.0.P
writew 0xA07E7B29 0x4210
#=================================================
#1.9.2.0.x.1.0.8.0. .3.0.P.H.D.R
writew 0xA07E7C21 0x4210
#=================================================

no change. (no autoexec on the left)

 

[Falsificator]

Try again:

A07E7559
A07E7651
A07E7749
A07E7841
A07E7939

 

[lacibaci]

Ok, I just realized that the first line "GARMIN DashCam 55 v3.70 - 36Mbit TEST" was missing a comment char (#)...
No change still.

#GARMIN DashCam 55 v3.70 - 36Mbit TEST
#=================================================
#2.5.6.0.x.1.4.4.0. .3.0.P
writew 0xA07E7559 0x4210
writew 0xA07E7651 0x4210
#=================================================
#2.5.6.0.x.1.4.4.0. .3.0.P.H.D.R
writew 0xA07E7749 0x4210
#=================================================
#1.9.2.0.x.1.0.8.0. .3.0.P
writew 0xA07E7841 0x4210
#=================================================
#1.9.2.0.x.1.0.8.0. .3.0.P.H.D.R
writew 0xA07E7939 0x4210
#=================================================

 

[Falsificator]

was missing a comment char (#)

 

[lacibaci]

I retested all without the first line (commented out) and still no go.

 

[Tobi@s]

Having no idea regarding Ambarella A12 but it might be a good idea to read and store the values on the sdcard you are trying to modify for debugging purposes?
As far as I know ther should be a readw command?
Maybe try something like
readw 0xA07E7559 > c:\reads.txt
This should store the current bitrate in the file if the address is correct?

 

[lacibaci]

Having no idea regarding Ambarella A12 but it might be a good idea to read and store the values on the sdcard you are trying to modify for debugging purposes?
As far as I know ther should be a readw command?
Maybe try something like
readw 0xA07E7559 > c:\reads.txt
This should store the current bitrate in the file if the address is correct?

I can do that. But how do I know that what I'm getting is a bitrate?

 

[Tobi@s]

You could post it here so we can verify it. Or you use a hex to dec converter and check it by yourself

 

[lacibaci]

Could not get anything out... Didn't even get anything with the original GETINFO script from nutsey. Maybe they disabled it in the latest firmware?

 

[Tobi@s]

strange, seems like they've disabled it. That would explain why @Falsificator modifications didn't work. Gopro did this some time ago as well, simply disabling autoexec.ash support via firmware update.