Recover shelley wallet after deleting everything and reinstalling and no 24 word recovery phases

I know when a wallet is created the seed words needs to be copied because next step is asking to insert again the seed words from the keyboard…

That’s why I am saying no way I could lost it. So now it’s sure that these 15 words are for Byron only and nothing can be done through these 15 words, right?

to be sure when u are using to restore in yoroi u should see under or near wallet name the byron word

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I have tried to restore both Shelley and Byron on Yoroi several times. So I got both there. But I can see transactions in Byron wallet but 0 balance in the Shelley one.
I was reading other posts that Yoroi was not stable and people couldn’t see their funds for many hours. Could it be the same in my case ?

You can try to import the Shelley wallet with the secret file, after that you only need the spending password. The import with file will work was a seed phrase.