I answer myself.

After some searching I found this page https://github.com/solana-labs/solana/issues/17325#issuecomment-844317674

Here The user "ghost" suggest:

solana-keygen recover ASK -o recov.json

This generates the .json in 64 bytes for the raw address.

With this json I could transfer to my ledger as:

solana transfer <LEDGER_ADDRESS> <SOL_AMOUNT> --from x:\solana-route\recov.json --allow-unfunded-recipient

In SOL_AMOUNT a small amount of fee must be left.