Take a new password and encrypt using BCrypt hash algorithm. There are many ways you can do. There are sites that can help you do it too.
Go to the PwmConfiguration.xml file and find the below line:
<property key="configPasswordHash" modifyTime="2019-12-11T18:53:29Z">
$2y$10$xxxwuvyrq__SOME_OLD_PASS_HASH_msMRwmrwkwjEYZ990u47IZYkpjZK</property>
Replace the old hash with the one you generated with new password so:
<property key="configPasswordHash" modifyTime="2019-12-11T18:53:29Z">$xxxxxxxxxxxxxxxx__NEW_PASS_HASH_HERE_sknsanlascknnsasncnaclanclascklcll</property>
Restart your pwm service and you should be able to get in with your new password.
It worked for me.
Cheers,
Arun