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2022 Zephyrus G14 GA402RK BIOS + IC

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    #1

    2022 Zephyrus G14 GA402RK BIOS + IC

    I have a G14 GA402RK that I (stupidly) changed the wrong settings on and now does not post. I changed the SOC power and the Above 4G MIMO limit.

    The device fans will ramp up and down as the temp rises, and the keyboard lights up, but the nothing else happens. It also powers up when plugged into the AC power but not USB or battery power. All of this makes me think it still works, I just need to slap a new BIOS on it.

    I tried identifying the IC with a CH341A programmer, but I could only find the GPU BIOS. I also read somewhere on this forum that Asus has used multi-IC BIOS solutions in the past, which makes this more fun for a newbie like me.

    Attached are pictures of the board, and the code behind the RAM slots which I think identifies the motherboard. If anyone can help me identify the BIOS IC and how to burn the new image on it if it's not a standard 8 pin IC, I would be very appreciative. Any and all help would be appreciated actually.
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    #2
    Re: 2022 Zephyrus G14 GA402RK BIOS + IC

    Originally posted by Madokami View Post
    I have a G14 GA402RK that I (stupidly) changed the wrong settings on and now does not post. I changed the SOC power and the Above 4G MIMO limit.
    there are 3 eeproms on your board, I think one from the left is Bios chipset - the middle is VBios and on the right is TBT. Take a clear photo of the code on chipset.
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      #3
      Re: 2022 Zephyrus G14 GA402RK BIOS + IC

      The one on the left is 24512A P21A02 and the one on the right is 24512A P21A03. Middle one is GD PJ2133, and is the one I got the gpu info from.
      Attached Files

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        #4
        Re: 2022 Zephyrus G14 GA402RK BIOS + IC

        Originally posted by Madokami View Post
        The one on the left is 24512A P21A02 and the one on the right is 24512A P21A03. Middle one is GD PJ2133, and is the one I got the gpu info from.
        yep, not bios chipset any of them. Maybe is on back of the motherboard, I will search on net.
        Edit: can't get a clear image but i think that's the one
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        Last edited by volinakis; 11-03-2023, 03:22 AM.
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          #5
          Re: 2022 Zephyrus G14 GA402RK BIOS + IC

          Originally posted by volinakis View Post
          yep, not bios chipset any of them. Maybe is on back of the motherboard, I will search on net.
          Edit: can't get a clear image but i think that's the one
          Yep, that's it. Winbond 74m25jweiq. I don't think the alligator clips will be able to grab this and I don't think I have the skill to desolder it. Is there any advice or a different method of reading/writing that you can recommend?
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            #6
            Re: 2022 Zephyrus G14 GA402RK BIOS + IC

            Originally posted by Madokami View Post
            Yep, that's it. Winbond 74m25jweiq. I don't think the alligator clips will be able to grab this and I don't think I have the skill to desolder it. Is there any advice or a different method of reading/writing that you can recommend?
            nope, just remove it and read with adapter. Attention, is 1,8V chipset. See if you have some jumpers around ram slots to reset it, if you say you only changed something in settings.
            Last edited by volinakis; 11-03-2023, 10:46 AM.
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              #7
              Re: 2022 Zephyrus G14 GA402RK BIOS + IC

              Originally posted by volinakis View Post
              nope, just remove it and read with adapter. Attention, is 1,8V chipset. See if you have some jumpers around ram slots to reset it, if you say you only changed something in settings.
              There are no jumpers on the motherboard, which is why I was looking to rewrite the BIOS. Removing the battery for an extended period did not help either. It would be nice if there were contacts on the board I could short to clear CMOS, but I don't see any and don't know enough to start poking around without guidance.

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                #8
                Re: 2022 Zephyrus G14 GA402RK BIOS + IC

                Originally posted by Madokami View Post
                There are no jumpers on the motherboard, which is why I was looking to rewrite the BIOS. Removing the battery for an extended period did not help either. It would be nice if there were contacts on the board I could short to clear CMOS, but I don't see any and don't know enough to start poking around without guidance.
                sorry, I don't have clear images of your motherboard to start looking for reset pads.
                Remove CMOS battery and hold power button for 30s to drain all current left in capacitors, maybe it will reset bios.
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                  #9
                  Re: 2022 Zephyrus G14 GA402RK BIOS + IC

                  Originally posted by volinakis View Post
                  sorry, I don't have clear images of your motherboard to start looking for reset pads.
                  Remove CMOS battery and hold power button for 30s to drain all current left in capacitors, maybe it will reset bios.
                  Unfortunately there's no cmos battery. I've tried removing the battery and letting it sit overnight, and that did not work. Here is a picture of the back side if that will help.
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                    #10
                    Hey ! Did you find a bios image ? If you did I'm having similar issues if you can send me the bios image it would be very nice i have asus g14 ga402rk Ryzen 9 6900hs and rx6800s 2022

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