Hello guys, one week ago i was doing my normal life like most of you, and suddenly this asus live update gave to me this 203 Bios update, so i was thinking "why not?" without knowing all the suffering I was going to feel after to do that, well, my G74SX died, and after that, my pursuit of the answer for this very big problem that I know most of you also were getting end this friday, when I found the way of how to fix this, and believe me guys, Im not a programmer and I did it, but I know most of you are on an ASUS support area maybe USA or surroundings, but it was not my case, im in Peru and this machine was bought on USA, so for me was going to be very difficult to get an ASUS solution, so I started to look for all kind of ways to solve this problem, and most of you are also in a big trouble because your warranty has expired, so here is the solution, for people who has the equipment to do this is ok, otherwise, you must contact an specialist who can take yous bios chip out of the motherboard and flash it on a different device, I dont know too much about this, but here in Peru there are many people who can make this job.
So here are the basic steps:
1. Gain access to the SPI ROM
2. Using a SPI ISP programming adapter, or device programmer, read and store
the bricked BIOS image (4MB, Winbond W25Q32)
3. Download, from Asus, the BIOS update file, for the version that you were
originally running, before the failed update attempt (V201 is on the driver
CD, V202, V203 are on the download site).
4. Using a hex editor, merge the two images as follows:
Reconstructed_Image 0x0 - 0x17FFFF = Bricked_Image 0x0 - 0x17FFFF
Reconstructed_Image 0x180000 - 0x3FFFFF = Update_Image 0x0 - 0x27FFFF
5. Program the Reconstructed_Image into your SPI Flash
6. Power-up or power cycle the laptop (your G74SX should be alive again)
7. Enter BIOS setup, by pressing F2
8. Select "Restore Defaults"
9. Save and exit
For those who can not make all this, I HAVE THE FULL 4MB BIOS RECONSTRUCTED FILE, send me a PM and i will be glad to be helpful for you.
Special thanks to PILGRIM who was following up all this process and helping me every day.