Unbricking Gome/Fake FlyTouch Android tablet

Update2:
See this post too: http://write-code.blogspot.com/2012/08/parallel-port-spi-flash-programmer-and-unbrick-wm8650.html
Update:
This blog post about total bricked Fake Flytouch - bootloader failed to start. If the devices turned on, the Blue LED will lit but the screen will remain black.
If you flash the wrong firmware, it might not fully bricked. Try to flash with new firmware, see comment post for the download link.

Introduction:
I bricked Gome/Fake? FlyTouch when upgrade its firmware by accidentally removing microSD card when upgrading w-load/u-boot in process. I don't know the exact name as the device itself doesn't have anything written on it except MID written on box.
It looks exactly like in this post: http://www.androidtablets.net/forum/gome-flytouch/1411-help-detecting-model-device-2-6-29-00236-g4f8dbbb-dirty.html#post8372

 

Reading through this thread, i found an interesting post about using LPT or Parallel port to reflash the bootloader IC using SPIPGM by Martin Rehak/RayeR. The SPIPGM can be found here: http://rayer.ic.cz/programm/programm.htm#SPIPGM



So, I begin disassemble FlyTouch by following this youtube video:

Then, I take out the cpu daughter board and begin identifying the chip needed to desolder. The chips have marking F40-100GCP (You can see the picture below). I just use a soldering iron and a solder suction as I don't have anything like hot-air station/solder wick. Before desolder, I use some kind of heatsink to protect the IC from being damaged by excessive solder heat.

The result

As you can see, I damaged the PCB! PCB traces peeled off. So if you want to desolder, make sure not to apply too much heat on the PCB.

Then, I start wiring the IC to the LPT according to the circuit diagram posted on RayeR's website: http://rayer.ic.cz/elektro/spipgm/spipgm.gif


Then, launch spipgmw.exe /i to identify the chip but it wont recognize and show parity Error. I recheck the connection, change the resistor and capacitor... then tried again... still no. After few days struggle with this, I found out bad connection between the chips and wire. So I changed by soldering the chips and use alligator clips instead.

The chips identified as EON EN25F40!, Then I tried to dump the SPI Flash by using this command
spipgmw.exe /d dump.bin

...
Dump successful!

Finally, it's time to reflash the chip. So, I made out my own binary file by combining w-load and u-boot and flash it into the chip (I cannot remember where I put the file, but you can get from here, not made by me). Before flash, it is important to erase it first.
spipgmw.exe /e
spipgmw.exe /p 4mb.bin

Then, I solder it back with new hope, Insert SD Card with new firmware and android boot!

Helpful link:
http://img840.imageshack.us/i/spipgmv2.gif/ - Circuit diagram
http://www.slatedroid.com/index.php?showtopic=5668 - De-Brick discussion
http://rayer.ic.cz/elektro/spipgm.htm - Post about spipgm
http://rayer.ic.cz/programm/programm.htm#SPIPGM - spipgm download
http://rayer.g6.cz/elektro/spipgm.htm
http://rayer.g6.cz/programm/programe.htm#SPIPGM
http://retired.beyondlogic.org/wp/4Mb_spi_flash.zip - Rom (Link updated on 19 May 2012)
http://projectgus.com/2010/08/unbricking-wm8505-based-tablets/