You will either need to convert the filesystem to GPT or reinstall after changing modes -- if you switch to UEFI mode, the existing installation will not boot.

On a system this age, if it's working as is, you may not want to undertake the project unless you have a specific reason (and Windows 11 is not a reason, as it's unsupported even in UEFI mode on this hardware).

You don't need UEFI or TPM support -- you can install Windows 11 without it.  And even with that TPM, the CPU you have will never be supported for Windows 11.  It WILL run -- for now -- but Microsoft has publicly stated that it may (and I read that, will) release updates that won't run on unsupported CPU hardware.  Windows 11 as it currently exists will run, but for how long, only Microsoft knows.

I want to install windows 11 with a registry hack. All I need is UEFI mode and secure boot and tpm 1.2. I can bypass rest of cpu insufficiencies. Can you tell me if I can use windows 11 on this setting and btw I know how to convert mbr to gpt

I have 2 computers at the moment that run on windows 11, one 8th generation i5 processor pc which met all requirements for windows 11 (high processor, UEFI secure boot and tpm 2.0) and one i3 .3rd generation processor PCR that I hacked. I want to install windows 11 now on my laptop Dell latitude e6410 and I want just UEFI with secure boot and tpm 1.2 rest I will modify registry. I don’t really need windows updates for my computers and I doubt Microsoft will do something in the future that will make windows 11 stop working on these computers with unsupported hardware.

Yes, and I'm also aware that without updates, Windows users are sitting ducks for malware attacks.  Windows 10 has at least another four years of updates left in it and will run on your system.  Windows 11 may run for now, but it's quite easy to envision a scenario in which Microsoft will cease updating Windows 11 on pre-8th generation CPUs -- while it's your choice, you should be aware of that eventuality.

It should be a simple matter of installing Windows 11 now.  As for not wanting Windows update -- well, when it comes to Windows 10 and 11, it's not a user choice.  You get them whether you want them or not -- at least up to the point where they do require a supported CPU.  

Well you must be aware that you can disable windows update in the registry so as to not get updates without personal consent 

We’ll, I have been using many windows 10 computers in my workplace since a long time and having installed updates on it and it’s working fine till now

I meant after installing windows 10 on my pcs I haven’t even upgraded windows once and don’t have any issues with it. 

Correct - but Windows 10 doesn't have a CPU requirement that Windows 11 does.  The fact that Windows 10 updates continue for most systems does not mean the same will hold true for Windows 11.

Sorry I meant I havent installed windows updates on these windows 10 computers from a long time and they are running fine 

Yeah

Let's hope your luck holds.

Something is always missing in the Extensible Firmware Interface System Partition and borks so I no longer do the convert method. I backup my data and then restore it when Windows 11 is up and running.

The time-consuming part was fixing the missing "Intel" drivers in the Device Manager. Since it's under security, it makes it a lot easier to find. Getting to A17 was tricky, It kept saying I needed A09 at least and it was on A05. A 10-minute search and I located it and 5 minutes later, I was on the latest. Here is my Dell Latitude E6410 Booting Windows 11 Pro.