Android : Lost my KeyStore and my old keystore is not vaild

I have lost my keyStore for my latest App update Version 9

I only have one old keyStore for the same App for Version 2

I tried to use it for genrate my app APK and it went well

but I can't update my Apk in my Google Play .. it says this Store Key is not signed " Your existing APKs are signed with the certificate(s) with fingerprint(s):"

Why I can't even use my old version of my key store !! ideas suggestions ?