My Firefly RK3288 is dead.

busybee

Use usb cable to connect the board with an Ubuntu PC.
Hold the RECOVERY button, then power on the the board.
On the PC, run:
sudo lsusb

Please post the result.

busybee

And I strongly recommend that you try the sd card boot.

Please follow:

https://plus.google.com/+IanMORRISON/posts/22Vxc6Sr5Ei
        
               
        
Download create-sdcard.7z, then extract it with:
# 7z x create-sdcard.7z

Download the Linux rootfs image
# cat downloadable-rfs-examples
Ubuntu 12.04 https://drive.google.com/file/d/0B99O3A ... Hg3ZWE3LXc
Xubuntu/Lubuntu 14.10 https://drive.google.com/file/d/0B99O3A ... lpTaEdfTXc

You can use either one rfs.
Move the download rootfs image to the working directory and rename it to linux-rfs.img

If you're using 64bit Ubuntu, install the 32 bit libc:
# apt-get install libc6:i386

Then run the script:
# ./create-linux-sdcard

Follow the prompt. The script will repartition your sd card and flash all the images to support sd card boot.

All commands above are run with root user.
        
               
        

busybee

The last resort is to force the board into maskrom mode.

Please have a careful look at the bottom of the board.

I've put the images here. You need to short curcuit T13 and C155. Detail steps:

      1. Power off the board.
      2. Plug out SD card if has one.
      3. Connect USB cable between board and PC.
      4. Short curcuit T13 and C155, and keep it.
      5. Power on the board.
      6. Wait some time and release the short curcuit.

The device should enter into maskrom mode.
(NOTE: Short curcuit here means connect the two points using wire or metal nipper.)



        

busybee

adamo.angelo Posted at 3/20/2015 23:29
Hi busybee.

I tried several times the procedure you describe here, but nothing happens; no outp ...

There's no serial output when entering maskrom.
Also, rkflashkit might not support maskrom mode.

Please run:
   sudo lsusb
to see if the device will be correctly detected first.

Then use rk's upgrade_tool in Linux or AndroidTool in Windows to proceed.


If the USB OTG port is broken, then the maskrom method does not work.
You've to resort to SD card boot. Does the SD card boot also fail?

If SD card boot also fails, check the hardware voltage described at the post:
http://developer.t-firefly.com/e ... =224&extra=page%3D1

busybee

adamo.angelo Posted at 3/23/2015 16:58
The problem is this: the OTG is not recognized: lsusb with cable connected and with no cable connect ...

Obviously, the OTG is broken.
Please check the connectivity using a multimeter.
It's very likely the OTG dock isn't sold well, or not well connected with the usb cable.

It's OK to flash the kernel partition by the Linux dd command. But this is not convenient.

busybee

Since the  system is recovered, we suggest you  do some test to the USB OTG in  Android system to see if the OTG is really broken.

You can plug a usb mouse/keyboard/harddisk to the otg port via an otg adapter.

1. If the mouse/keyboard/harddisk works, then otg function is considered good.
   You can check the RECOVERY and RESET button.

2. If the devices do not work, check the voltage drop of the OTG DM to GND, and OTG DP to GND.
(Use the diode function check of the multimeter). Post the result here.

busybee

adamo.angelo Posted at 3/27/2015 01:56
OTG doesn't work. I connect a pendrive through an adapter cable, but it is not recognized, while in  ...

Not voltage, but voltage drop.

2. If the devices do not work, check the voltage drop of the OTG DM to GND, and OTG DP to GND.
(Use the diode function check of the multimeter). Post the result here.