Questions about GIGABYTE products > Motherboards with Intel processors
GA-Z87X-UD3H. Cant disable fast boot. Now lost main bios.
shadowsports:
Difficult one for sure.
Try holding the Shift key when you are in the OS and select restart from the start menu.
In windows 10 the ways to get into BIOS (normally) using PS/2 keyboard are:
DEL key
Advanced Recovery > Troubleshoot in settings
Holding Shift while restarting (accomplishes same as above)
BIOS resync
I recommended ALT+F10 with the hope of getting your main BIOS chip resynchronized. (BTW) I have tested this on one of my boards and it does work. Z97 one gen later than yours.
ALT+F12 works on AMD based boards.
Ultra Fast Boot Disables USB detection (Partial or Full initialization as well as XHCI (older boards).
So where does that leave us.
What about...
Fast Boot option in Power Management - remember W10 uses a hybrid version of hibernate/sleep to start itself more quickly. Try experimenting. Disconnect power from board, press and hold power button 30 sec to fully discharge residual power. Reconnect and retry my key combinations from a "real" cold boot.
Starting in SAFE Mode (MSCONFIG)? Now try the Advanced Recovery Troubleshoot option or shift key. Safe Mode is also an advanced start option from this subset of menus.
You can try removing the memory, starting the system "shocking" it then reinstall one DIMM in a random slot, start again, power off, then insert RAM correctly, and restart again. Note I'm using the term "shock" as in confusing it, not actually doing anything to cause anything electrical to occur. I cannot with good conscience recommend using unsupported RAM (if you had some laying around), disconnecting the CPU FAN, or 12v ALT power, actually the last being safe and the system most assuredly wouldn't start. Would rather stick to conventional safe methods.
Are you sure you've followed the correct steps for CLR_CMOS or BIOS reset (for your board)? Power connected/disconnected - refer to your manual for the correct procedure.
Hopefully something above will help.
fisyyma:
Already tried most of the things you mention. Now also tried the memory removal. Without the memory the motherboard continually starts and then resets within a few seconds. With the memory back in place, its back to booting straight into the operating system.
As for the correct method for resetting the bios: I have shorted the reset pins, pressed the bios reset button which this board has. Also removed battery and disconnected the pc power supply from the board and left overnight.
What happens if I start the pc with the backup bios, which is what I am forced to do now. Then use the DOS method to flash the bios with an earlier version. I assume that will only flash the main bios and leave the backup bios intact, in which case I will be no worse off than I am now, and will still be able to start the pc using the backup bios?
shadowsports:
--- Quote from: fisyyma on June 26, 2019, 04:28:32 pm ---Already tried most of the things you mention. Now also tried the memory removal. Without the memory the motherboard continually starts and then resets within a few seconds. With the memory back in place, its back to booting straight into the operating system.
As for the correct method for resetting the bios: I have shorted the reset pins, pressed the bios reset button which this board has. Also removed battery and disconnected the pc power supply from the board and left overnight.
What happens if I start the pc with the backup bios, which is what I am forced to do now. Then use the DOS method to flash the bios with an earlier version. I assume that will only flash the main bios and leave the backup bios intact, in which case I will be no worse off than I am now, and will still be able to start the pc using the backup bios?
--- End quote ---
Greetings - A for all your efforts.
Your flashing question. The BIOS that the system boots from, is the one that gets flashed. Doing this, should reset BIOS values to default and give you the option to regain control. If successful, then ALT+F10 should synchronize the two chips repairing the main BIOS.
However, you need to understand their is considerable risk. I've seen cases where the boot block gets damaged and/or the hex offset gets changed leaving you with no way to recover or reflash and "broken" chip. Ya, you unsolder it from the board and put it in a chip reprogrammer you may increase your odds, , but I don't have one laying around for the 1 time is 10 yrs you wish you had or needed one.
So, understanding the risks, this will have to be your decision. I will be interested to learn of your success (which I hope for), or failure. Good luck!
fisyyma:
Just read this on the Gigabyte site. It mentions booting from the functioning bios, then using the SW-BIOS switch to select the bios you intend to flash. Even though it doesn't directly relate to my motherboard. I was wondering if it has also been designed to work in the same way.
You mention above that it will flash the bios that the machine was booted from, regardless of the SW_BIOS switch position at the time of flashing. Clearly that isn't the case for all Gigabyte motherboards, but I can't find any information on this regarding mine, so unless someone can confirm whether this is, or isn't the case, it may be worth a try.
How to fix corrupt BIOS ROM with BIOS Switch (BIOS_SW)?
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Please follow below procedure to fix corrupt BIOS ROM that not physically damaged:
Turn off the computer.
Adjust SB switch to Single BIOS mode.
Adjust BIOS switch (BIOS_SW) to the functional BIOS.
Boot up the computer and enter BIOS mode to load BIOS default setting.
Adjust BIOS Switch (BIOS_SW) to the non-working BIOS.
Flash the BIOS by using Q-Flash.
Reboot and confirm if BIOS is working.
Shut down the computer and adjust BIOS Switch (BIOS_SW) to original BIOS.
Boot up the computer and confirm BIOS are working properly.
shadowsports:
Greetings,
The issue for you remains... you can't get into the BIOS. How are you going to flash using QFLASH?
By all means please try it, if you can figure out how to get into QFLASH. There is another possible scenario, but I can't say what might happen. Boot into windows BIOS2, change switches to BIOS1, perform @BIOS flash, and if you're lucky, the system will flash BIOS1. Big "if" here.
But again, considerable risk. If you can send the link to this page/article you referenced, I'd appreciate it.
The lack of clear documentation is what we are up against here.
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