Windows 10: How do I update from 1809 to 1903 using an ISO on a USB?

Yeah, this is basic and I =think= I know what to do, but...assume and all that.

Going here: Create Bootable USB Flash Drive to Install Windows 10 it's pretty straightforward on how to create an install ISO. (I've used this technique before when doing reinstalls. Thanks.)

How would I use that ISO on a USB stick to perform an update from 1809 to 1903, and NOT do a repair install or reinstall?

Am I overthinking this?

(This is because the update, despite saying it's ready to be downloaded and installed, does not work. It rolls back to 1809. I've since updated my laptop's BIOS and have also been told installing from a USB is less likely to fail.)

Thanks,
Ken

:)

 

Update Windows 10 - From 1809 to 1903

If we suppose we have windows 10 1903 in DVD or USB.

Can we update windows 10 1809 to 1903 with 1903's DVD? (offline update)

 

Creating Featuire 1903 update ISO with Media Creation Tool

Hello--I understand the process of using the Media Creation Tool to create the Feature 1903 ISO.

I will use the MCT when I have access to a better internet connection in July.

Feature 1903 Update has showed in the Separate Module in Windows Update on my notebook. So it is ready for my notebook.

I will be getting just the X-64.

Roughly how long does MCT take to save the Feature 1903 x-64?

Not sure how large the ISO is for 1903, but the 1809 ISO was 4.7 Gbs

 

W10 1809 to 1903 update

Lenovo ThinkCentre E73, I have updated from W10 1809 to 1903 and the PC has now gone really slow and having issues with admin rights, I have chkdsk'd and scannow'd' but no issues found. Tried an inplace update in case windows was corrupted and get the
message some hardware on this PC is incompatible with 1903 update. Can anyone shed any light in these issues please. I have had to revert to 1809 to make the PC usable again. Any suggestions please ? Microsoft have said Lenovo are responsible and Lenovo have
said Microsoft is responsible, which does not help me one bit.