Nero243

Its pretty easy if you can do some bios modding heres the guide: It didnt work exactly like this with my Dell M3800 (I7 4702hq). It wouldnt post if the microcode length was diffrent so i just copied the V01 microcode in the the original V24 from my Bios and left the rest of the 24 there so the length matches. I attached some haswell microcodes so you don't have to run around with the buggy V00 (CPU internal MC) version. Everything up to V07 allows OC but i think everything after V05 only allows it to 3,6GHz Haswell microcodes.zip

I think my BIOS Mod finally worked, the vBios is 2 times in the normal AMI Bios once as Option ROM and another time seperatly. The DEV ID is once in the Option Rom section right before the vBios and in both vBios's. I changed it there and changed it in both vBios's with adjusting the checksum over kepler bios tweaker. Now the GPU comes up as "Microsoft Basic Display Adapter", for some reason the DEV ID in Windows changed to 11D7 (its still 11F6 is the modded vBios's) and has the Error Code 31 "The Driver trying to start is not the same as the Driver for the POSTed Display Adapter". I think i'll change the vbios again to 11D7 and look whats going to happen. I still think the Chip is dead but at least i guess i'm getting somewhere in terms of Bios modding c: Edit: The changing DEV ID depends on the selected bios PCIe and IGPU settings, i hope this is just because the chip is dead or the whole resistor id thingy wouldn't apply to onboard GPUs.

First of all thanks for your fast answer! Flashed a new Bios with a modded vBios from a xps 9530 (GT750m), disabled the IGFX and set it to PCie. Still boots up with the IGPU and the Device id of the Nvidia GPU changes again with subsys all zero. And yes it wobbled a bit up on the corner, i only preheated it for like 2mins with the heatgun before cranking up the heat to melt the solder. Used the same Temps i had when unsoldering and the old chip and it still looks fine. So i guess i popcorned it, wasn't expensive but still annoying. Was my first try on BGA, i only did lots of SMD soldering before. But you think a BGA swap with a onboard GPU should be possible? Then i'm going to search for a new chip and try it again. How long should i preheat a chip, before soldering, and at what temperatures? Also does the vBios Checksum matter? I can flash everything with afudos /gan or with my CH341a so nothing is being checked.

I bought a Dell m3800 on the cheap and want to beef it up a bit, by exploiting the haswell microcode glitch and swapping the on board gpu. The Dell m3800 has a quadro k1100m, chip says n15p-q1-a2. I switched it with one from a gtx765m (double the shaders same 128bit memory interface), the chip is named N14E-GE-A1. I think the soldering went well, I masked everything around the chip with a few layers of tinfoil as heatshield and used a heat gun to preheat it slowly and increased the heat later on. All solder balls were melted and I could pull the old chip clean off. After that I cleaned the joints with desolder strips, Flux and a big solderingiron. When soldering the new chip in the same way it dropped in one corner first and the rest came a moment later :/ but I still think it should make contact everywhere. So to my problem, the gpu is not being detected in gpu-z at all. It only shows up in the device manager under other devices as "3d video controller" with error code 28 windows couldn't find any drivers. Nvidia drivers need to be inf modded because the hwid isn't found anywhere. Not even in the drivers that came with it from Dell. When trying to install them it fails at some point and after that the device manager shows the gpu as "unknown device" :c Anyhow I think it ran with the open-source nouveau driver in Linux, after that I installed the proprietary one and now the install is broken. Have to try this again today. I know there are people here who did some gpu swaps and have a bit more knowledge than me. Problems could be: bad soldering, vbios incompatibility (wanted to pull it before the swap, was locked down), wrong resistor value for the gpu (I think the hwid changed with the gpu swap, but it should only be related to the one resistors some folks mentioned in another thread) Have to try it again with the nouveau driver to strike the first error reason from the list, or confirm it I guess... Edit: So i've read the other thread again about bga gpu swaping, found here Seems like the ID Resistor is only responsible for the for the last two digits of the HWID, if you take a look at the HWID database here https://vendev.org/pci/ven_10de&dev/ all the GTX 7XXm start with 11XX and the quadro k1100m ends with XXF6. Seems like i have half GTX765m and half quadro in my HWID. So i'll probably have to find my ID Resistor and change it with something from a Graphicscard with the right GPU. Edit2: Got the driver installed with inf mod to a gtx 760m but gpu-z is still not recognizing it. Also nouveau in Linux is complaining that no usable (v)bios was found. The vbios is inside the normal bios on this model. I tried simply inserting a acer 760m bios and flashed it. It'll still boot etc but everything is still the same

So yeah, I bricked my m3800 now multiple times trying to get some bios mods running. (older microcode version for haswell oc and menu unlock). For some reason the damn thing is stuck with a blackscreen before post if the bios has some modifications, even the end + powercord recovery isn't working. I have a CH431a Flasher so recovering isn't that big of a deal. I have to desolder the chip everytime tho and i currently don't have access to my good soldering equipment... Did Dell lock something down with the newer A10 Bios? Didn't seem to be a problem with the A09 version. Hi there, I bricked my dell m3800 (xps 9530) yesterday after i pulled the bios from chip did some minor changes to it and reflashed it with afudos and the allmighty /GAN force flash :| I tried to use the bios recovery mode, it only reads the usb stick for a short time and then nothing happens. I think i have to desolder and rewrite the bios to the chip manually. So what do i have to write to the chip the 8 mb rom file or the 6.5 mb HDR file or both? The file i pulled with afudos was also just 6.5 mb (might be the reason why it's bricked).