I’ve reset my Windows laptop this weekend. Applied all the updates available via Windows Update, MS Store and the OEM driver update tool - and I’m stuck on Windows 11 21H2 
Guess this is what the laptop came with.
Is there a limit how far back Windows Update will update from? Any other reason it won’t update me?
Guess I’ll have to use an ISO and do an in-place upgrade.
Traditionally, I think if Windows detects something it can’t or won’t support, it locks you from upgrading into an unsupported version. It’s quite unfortunate that they don’t seem willing to communicate the situation at all. I think the in place upgrade is your best option.
Thanks. Is it OK to upgrade in one go, or should I go 21H2 to 22H2 to 23H2 etc?
I think you should be fine. There is supposed to be support to upgrade from any [past] supported version to any future supported version, unless communicated otherwise by MS. Think of it as a ladder… the upgrade process will do the steps it would do going from one version to the next separately.
As ever, a backup is not a bad plan, just in case, however.
All worked. Now on 24H2, thanks for the advice 
Also, with a fresh installation, didn’t it used to wait a couple of weeks, before offering version upgrades, to ensure everything is running smoothly.
With most of the new PCs we get, we manually upgrade using the ISO, when they arrive.
I often suspected it did that, but if that’s their process, you would wish they could at least clearly state what’s up and give you a chance to be the one in control of the process. All they would need would be a “power user” tool that gave the status and gave the means to clear any block(s) and reset any timers.
Agree. It should be all users, too, not just power users.
Windows Update says ‘You’re up to date’ when you are actually on a version of their OS that went out of support in October 2023.