How to handle a lost KeyStore password in Android?
See this link
It's unfortunate, but when you lose your keystore, or the password to your keystore, your application is orphaned. The only thing you can do is resubmit your app to the market under a new key.
ALWAYS backup up your keystore and write the passwords down in a safe location.
Just encountered this problem myself - luckily I was able to find the password in some Gradle's temporary file. Just in case anyone lands here:
try looking for this file
..Project\.gradle\2.4\taskArtifacts\taskArtifacts.bin
or
.gradle/3.5/taskHistory/taskHistory.bin
.gradle/5.1.1/executionHistory/executionHistory.bin
.gradle/caches/5.1.1/executionHistory/executionHistory.bin
.gradle/5.1.1/executionHistory/executionHistory.bin
.gradle/3.5/taskHistory/taskHistory.bin
.gradle/2.10/taskArtifacts/taskArtifacts.bin
and search for
storePassword
It was there in cleartext. In general, if you do remember at least a part of your password, try searching for a file containing this substring and hopefully you will fish out something.
Wanted to throw it out here, maybe it will eventually help someone.
Edit: Added new insight from comments, just to be more visible. Edit 2: Added some more locations reported in comments.
Thanks to Vivek Bansal, Amar Ilindra and Uzbekjon for these.