Passcode not working after upgrading to Win phone 10 insider preview, how can I get into my phone?

[Windows Central Question]

Passcode not working after upgrading to Win phone 10 insider preview

After installing one of the updates of the insider preview of Win phone 10, my passcode has stopped working. Has anybody else run into it? How can I solve the problem?

 

[ven07]

Re: Passcode not working after upgrading to Win phone 10 insider preview

Downgrade to 8.1 using the windows phone recovery tool