When I tried to restore this wallet using the Electrum Android app there is no way to enter capital letters, only lowercase.
Which version of Electrum Android app are you using?
Because the latest version (
and even the old version) should be able to accept uppercase characters for BIP39 Passphrase compatibility.
Screenshot:
As you can see in the screenshot, you're supposed to scroll-down to type the passphrase below the "
Extend seed with custom words" check box.
Your android keyboard app should pop-up, do not use the provided in-app keys which is for your seed phrase above.
Anyways, as mentioned, electrum's seed phrase extension is case-insensitive while BIP39 seed's passphrase is case-sensitive.