Fujitsu U939X BIOS Recovery (EC Corrupt)
I was clean install Windows 10 Pro without installing driver, because i believe windows will download itself.
But 2 days later it hard bricked, just battery LED charge indicator when plugged in, no boot or even post. Unplugging the battery will result zero response, LED flicker 0.1s and then everything turned off, no response to any button. Main BIOS powered 3.3V but EC is 0V.
So i though it just BIOS corrupted, and confirmed EC BIOS has been corrupted (First header is 55 AA 01 00 FF FF FF and the rest is always FF FF until offset 10000 with 00 00 blank and 11000 where random hex code exist).
I went dump all 128Mb and 64Mb bios to merge it with windows copy /b command, then opened it with Intel Flash Image Tool to clean ME.
Settings change Generate Intermediate Files set to No and Boot Guard Profile set to 0 (NO_FVME)
I built it with right ME version (12.0.47.1524), SKU, Chipset, and Family (CSE ME). Everything went well so i extracted built result for EC partition, which is right 1024 kb file size (Header is PHCM).
I've reflashed all three BIOS (128 + 64 and EC BIOS) and soldered all them again, removed flux and the board is really clean now.
But when i plug the charger, the WiFi LED is blinking twice (with 1s delay each) and then reset entire system and keep looping. It cannot even make POST.
Reflashing dumped U939 BIOS (everything similar but no Touchscreen) will make entire LED blinking without boot.
Unfortunately there is no service information about this laptop, which i'm stuck in here for weeks, trying solve the mystery.
If someone has experience similar problem with me, please share in the comment. Thank you
But 2 days later it hard bricked, just battery LED charge indicator when plugged in, no boot or even post. Unplugging the battery will result zero response, LED flicker 0.1s and then everything turned off, no response to any button. Main BIOS powered 3.3V but EC is 0V.
So i though it just BIOS corrupted, and confirmed EC BIOS has been corrupted (First header is 55 AA 01 00 FF FF FF and the rest is always FF FF until offset 10000 with 00 00 blank and 11000 where random hex code exist).
I went dump all 128Mb and 64Mb bios to merge it with windows copy /b command, then opened it with Intel Flash Image Tool to clean ME.
Settings change Generate Intermediate Files set to No and Boot Guard Profile set to 0 (NO_FVME)
I built it with right ME version (12.0.47.1524), SKU, Chipset, and Family (CSE ME). Everything went well so i extracted built result for EC partition, which is right 1024 kb file size (Header is PHCM).
I've reflashed all three BIOS (128 + 64 and EC BIOS) and soldered all them again, removed flux and the board is really clean now.
But when i plug the charger, the WiFi LED is blinking twice (with 1s delay each) and then reset entire system and keep looping. It cannot even make POST.
Reflashing dumped U939 BIOS (everything similar but no Touchscreen) will make entire LED blinking without boot.
Unfortunately there is no service information about this laptop, which i'm stuck in here for weeks, trying solve the mystery.
If someone has experience similar problem with me, please share in the comment. Thank you
