Fix Windows Error 0x1b93 – Activation Reset Limit Reached

You've hit the activation reset limit for Windows. This usually happens after multiple hardware changes or license transfers. Here's how to fix it without reinstalling.

Quick Answer (for pros)

Run slmgr /ipk then slmgr /ato. If that fails, phone activation is your next move. Don't bother with registry edits — they rarely help here.

Why You're Seeing This Error

This error — 0x00001B93 or ERROR_ACTIVATION_COUNT_EXCEEDED — happens when Windows has already been reset the max number of times for that specific installation. Microsoft lets you transfer a license a few times (usually 3-5), but after that, it locks the key. This often pops up after you swap a motherboard or do a major hardware upgrade. I've seen it most on Windows 10 Pro and Windows 11 Pro machines that were originally OEM or retail copies.

The system thinks you're trying to activate a new PC. It's not a bug — it's a policy limit. But you can still fix it.

Step-by-Step Fix

Open Command Prompt as admin. Press Win+X, then select Command Prompt (Admin) or Terminal (Admin).
Check your current activation status. Run slmgr /dlv and look for the line showing how many resets you've used. If it says "Activation count exceeded," you're in the right place.
Re-enter your product key. If you have a digital license tied to your Microsoft account, skip this. Otherwise, run slmgr /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX (replace with your key).
Try activating again. Run slmgr /ato. If successful, you're done. If you get the same error, move to step 5.
Use phone activation. Run slui 4 to open the phone activation menu. Pick your country, call the number shown, and follow the automated prompts. The system will give you a confirmation ID. Enter it in the boxes provided.
If phone activation fails, call Microsoft support directly. Explain you hit the reset limit after a hardware change. They'll often reset the activation count on their end. Be ready with your product key and the PC's hardware ID.

Alternative Fixes (if the main steps don't work)

Use a different product key. If you have a spare key (like from another dead machine), try that. It's a quick workaround.
Run the Activation Troubleshooter. Go to Settings > Update & Security > Activation and click "Troubleshoot." Pick "I changed hardware recently" and sign in with your Microsoft account. This can sometimes refresh the digital license.
Clean install with a fresh key. If everything else fails, a clean install with a new key is the nuclear option. It resets the count entirely.

Prevention Tips

To avoid this error in the future: link your license to a Microsoft account. That gives you more leeway with hardware changes. Also, don't activate and deactivate Windows more than a few times a year. Each reset counts against the limit. If you're planning a motherboard swap, deactivate Windows first (via slmgr /upk) and then reactivate after the swap. That preserves your reset count.

And seriously, stop using the same key on five different machines. Microsoft's backend tracks that stuff. It's not worth the headache.