<p> Thank you for the reply, currently I am able to install Mountain Lion. I took care of the SMbios, I need more info regarding AICPUPM and Graphics, I used Graphics Enabler=Yes and the installer loaded in native resolution.
<blockquote class="ipsBlockquote" data-author="Hervé" data-cid="2468333" data-time="1500885086"><cite class="ipb" contenteditable="false">Hervé, on 24 Jul 2017 - 09:31 AM, said:<div><p>It would appear you did not follow the guide properly and ignored some critical steps such as this one:
<p><em><span style="color:rgb(0,128,0);font-family:'times new roman', times, serif;">7. Use pacifist to extract kernel from “OS X Installed ESD/Packages/<span style="color:rgb(0,128,0);font-family:'times new roman', times, serif;">Essentials.pkg/System/Library/Kernels/Kernel<span style="color:rgb(0,128,0);font-family:'times new roman', times, serif;">” and copy it to /System/Library/Kernels/ (You may need to create the “Kernes” folder) (note: this is in the attachment).
<p><em>Mavericks was the last OS X version to have the kernel file labelled as "mach_kernel" and located at the partition's root. Since Yosemite, all kernel files are called "kernel" and placed in /S/L/Kernels. Since you appear to make your USB installer manually, you'll need to create that folder (because it'll not exist by default) and copy the appropriate extracted kernel file to that folder.
21posts and 5years on the forum with similar queries for 2 other laptops in recent months; I take it you're aware of the basics & the essentials and know how to create a USB installer by now...
Regarding this new Vostro 3550 of yours, it's going to be of similar specs as the McBookPro8,1. So that's what you need to target as SMBIOS profile. For HD3000, you'll be looking at injecting laptop SNB layout-id 0x00010000 either through DSDT patching of through Clover if graphics don't work OOB.
It's a SandyBridge platform so you'll need the AICPUPM patch to avoid CPUPM-related KP. You can either use a pre-patched kext (copies for Yosemite available here for instance) or use Clover's Asus AICPUPM option.
For the rest, well you'll have to identify the specs of your audio, LAN, wireless, SD card reader, touchpad, etc. You can refer to Dell's support web site and/or Windows Device Manager to that effect.
thank you so much for the info, but my previous 2 laptops were a breeze. i tried clover (legacy) to make usb installer, but in wain. need more info regarding that process