@[email protected] @[email protected] that's a security feature. it won't let you update an app if the signer has changed. the main reasoning for that is most likely to avoid unauthorized access to app's internal storage. on earlier versions of android it was a common practice for power users to patch the system to remove the signature check, but afaik on recent versions noone really does that (btw if you think that's bad you definitely haven't seen how ios requires apps to be signed, android is honestly a bliss in that regard)