Windows 11 Pro 25H2 (insider preview) free upgrade installation on officially-unsupported outdated PC

[dualazmak]

According to this article,

Windows 11 KB5077181 fixes gaming bugs, Nvidia black screen, and performance issue affecting explorer.exe, taskbar, and Start menu

KB5077181 could make some PCs faster if explorer.exe was hanging on your system, and it also fixes the black screen issue on Nvidia GPUs.

www.windowslatest.com

the latest update patch KB5077181, which makes "OS build 26200.7840", looks feasible and suitable for fixing several recent issues in Windows 11 25H2.

I have already done it in all of my PCs as shared in my above post #119.

 

[pablolie]

According to this article,
https://www.windowslatest.com/2026/02/15/windows-11-kb5077181-fixes-gaming-bugs-nvidia-black-screen-and-performance-issue-affecting-explorer-exe-taskbar-and-start-menu/
the latest update patch KB5077181, which makes "OS build 26200.7840", looks feasible for fixing several recent issues in Windows 11 25H2.

I have already done it in all of my PCs as shared in my above post #119.

I had a weird issue with the Thinkpad X270 (onto which I did a clean W11 install, not an update). Every other reboot, the laptop keys and mouse would not work. Another restart would fix that. The latest updates seem to have resolved that. I found it interesting Lenovo issued driver updates for the X270 (not compatible by one CPU gen) for W11.

 

[dualazmak]

The article link in my above post #121 has been corrected.
Therefore, @pablolie, if possible, you would also please correct your post #122 accordingly.
Thanks in advance for your kind cooperation.

 

[dualazmak]

As of today, 2026 April 15 Japan Time, in all of my Windows 11 Pro PCs including the officially-unsupported outdated PCs shown in my post #29, Windows 11 Pro 25H2 has been successfully updated to version 25H2 OS build 25200.8246.

Now I use one additional very much outdated PC (consists of M/B ASUS B75M-PLUS, CPU Intel Core i5-3450, MEM 16 GB, OS-SSD 128 GB, GPU NVIDIA GeForce GTX970, two of 4-port fan controller, etc., all found in one of my junk boxes!), connected to dual EIZO FlexScan EV2750 monitor 1440 x 2560 desktop area of 60 Hz refresh rate, just for test/confirmation/validation of Windows 11 Pro 25H2 updates, as well as for HDD-to-HDD and SSD-to-SSD simple disk copy platform which is assembled on very cheap open kitchen-cage-frame but built in very quiet shape thanks to the eight(8)-port fan controllers.

 

[Ruediger]

I can recommend Win11 on all CPU's back to Intel series 7 and Ryzen series 3. With earlier Intel chips the iGPU might not perform as expected, but otherwise the physical limit for installs is even much more back in time. I did never try older Ryzens.

"Unsupported" installs are mainly coming from the proper TPM2 requirement, which is a given check from Intel series 9 on - so that is the official "good" generation start.

With the UEFI 2026 topic many older PCs are out of secure boot support by mid this year. Basically every board that did not receive a BIOS update yet with the new Cert/KEK is out. Everyone has to decide for themselves if they need the heightened security level realized from secure boot on that specific machine. It's no problem to just turn it off and continue with the rest unchanged.

As an IT guy the first thing I do with a Win11 ISO is remove all requirements, install questions etc. - currently a new battle with MS trying to make an MS account required for installs. But IT usually wins.

The only downside from "unsupported" installs could be that the major upgrades (like 26H1 f.e.) might require a manual install on those machines. As requirements might be checked at install time for these. But I have seen that not be true/a real issue. At least not as long as the upgrades come in via monthly updates and then get an enablement package. It will be different with system re-installs and such.

 

[Snarfie]

Using an old Lenovo Thinkpad X230 running win11 flawlessly ( installed with Rufus which by pass all annoying Microsoft questions) is it a wise idea to let Windows install version 25H2. Could endup with limitations or shutdowns perhaps.?

 

[JanRSmit]

Using an old Lenovo Thinkpad X230 running win11 flawlessly ( installed with Rufus which by pass all annoying Microsoft questions) is it a wise idea to let Windows install version 25H2. Could endup with limitations or shutdowns perhaps.?

Be aware for driver issues. I did this on a nuc3 and the serial port (USB) failed to work under w11. So back w10

 

[pablolie]

I am running Win11 25H2 on "non approved hardware" perfectly fine.

 

[Snarfie]

I am running Win11 25H2 on "non approved hardware" perfectly fine.

View attachment 525104

Suppose you get later issiues could you roll back to 24H ?

 

[pablolie]

Suppose you get later issiues could you roll back to 24H ?

It wouldn't be my favorite thing to do, but yes, I could (I make a copy of the hard drive image every time I do a really big update, and given the reservations that existed around 25H2 I made sure to do that). But if I run into issues on this machine, I'd probably just go Ubuntu.

No indication of that though, and I have been running 25H2 since it came out.

 

[Snarfie]

It wouldn't be my favorite thing to do, but yes, I could (I make a copy of the hard drive image every time I do a really big update, and given the reservations that existed around 25H2 I made sure to do that). But if I run into issues on this machine, I'd probably just go Ubuntu.

No indication of that though, and I have been running 25H2 since it came out.

So your cpu an tmp was not up to specs?

 

[pablolie]

So your cpu an tmp was not up to specs?

The CPU is 7th gen, I think only 8th gen is "Win 11 Capable" according to Microsoft's self-serving expertise. TPM2.0 is supported, I think pretty much every computer after 2016 has it.

 

[Snarfie]

The CPU is 7th gen, I think only 8th gen is "Win 11 Capable" according to Microsoft's self-serving expertise. TPM2.0 is supported, I think pretty much every computer after 2016 has it.

My worry is my TPM 1.2. The third generation i5 processor is fast enough.

 

[Ruediger]

Be aware for driver issues. I did this on a nuc3 and the serial port (USB) failed to work under w11. So back w10

NUC was acquired by Asus. You might want to check their support for a new bios and serial IO driver. If it's not too old it's all there. Intel has stopped updating the platform quite some time ago. These things don't come via Intel DSA anymore.

 

[Ruediger]

My worry is my TPM 1.2. The third generation i5 processor is fast enough.

The actual limit is below series 3 (iirc it is cpu instruction based and the old core series is out). But this might change in the future with newer kernels.

You can disable the tpm requirement. No bitlocker, no other software that wants to use tpm2 then. And a drawback in security to Win10 level. There is not much to miss besides laptop theft protection, the one case where bitlocker is somewhat handy.

 

[pablolie]

My worry is my TPM 1.2. The third generation i5 processor is fast enough.

But staying on 24H2 is the same as staying on Win10 - security updates shall stop. :-/

 

[xanalog]

NUC was acquired by Asus. You might want to check their support for a new bios and serial IO driver. If it's not too old it's all there. Intel has stopped updating the platform quite some time ago. These things don't come via Intel DSA anymore.

There has been a cautionary note to it:.

Caution: Some community reports suggest checking memory compatibility lists before updating via ASUS, as some updates may cause issues with certain RAM configurations.

 

[dualazmak]

NUC was acquired by Asus. You might want to check their support for a new bios and serial IO driver. If it's not too old it's all there. Intel has stopped updating the platform quite some time ago. These things don't come via Intel DSA anymore.

Just for your (our) info, in my old Intel NUC, Windows 11 Pro 25H2 and all the relevant drivers etc. have been periodically successfully updated, and now it is Windows 11 Pro 25H2 build 25200.8246.

As I shared in my post #29 and #22, the specific NUC is;
2. tiny Intel NUC-PC monitoring internet access router and LAN traffic, in my office (ref. post #22)
M/B: Intel NUC D54250WYK _chipset: Intel Lynx Point-LP (Premium)
CPU: Core i5-4250U (Haswell ULT)
MEM:16 GB
OS-SSD: 256 GB
GPU: CPU incorporated Intel HD Graphics 5000

 

[Ruediger]

There has been a cautionary note to it:.

NUCs are not very prone to problems with RAM speed/voltage and overclocking profiles on the dimm. In the DDR4 so-dimm laptop memory world, where the older models are, most people would have RAM to the specs and nothing exotic.

But it's good to check. Overclocking profiles are available and fast RAM was too. There have been changes to memory things with the BIOS on other platforms. If the RAM worked before the worst thing that could happen is that it now needs default mode and not overclock profile though. Never seen that happen, but it's possible.

 

[Ruediger]

Just for your (our) info, in my old Intel NUC, Windows 11 Pro 25H2 and all the relevant drivers etc. have been periodically successfully updated, and now it is Windows 11 Pro 25H2 build 25200.8246.

As I shared in my post #29 and #22, the specific NUC is;
2. tiny Intel NUC-PC monitoring internet access router and LAN traffic, in my office (ref. post #22)
M/B: Intel NUC D54250WYK _chipset: Intel Lynx Point-LP (Premium)
CPU: Core i5-4250U (Haswell ULT)
MEM:16 GB
OS-SSD: 256 GB
GPU: CPU incorporated Intel HD Graphics 5000

My oldest NUCs are series 11 currently and went through the win upgrades like every other PC. Intel DSA stopped delivering things other than bt/wifi/gpu long ago. The necessary later updates are all over at Asus.