I put 4 out new outlet in my basement room I use 14 wire and 15 amp outlet. When I hook up to the outlet there I found out its on a 20 amp breaker. Can I change the 1st outlet to a 15amp GFCI outlet. Thnaks Dave

Hmm you probably either need to change your wire to #12 or your breaker to a 15 AMP. Either way, an overload with 14 AWG wire could cause problems in the future.

The same answers that you received on your other post still apply. You must either change the breaker to 15 amps or change your wire to 12 gauge.

If your question really is "Can I use a 15 amp GFI at the first outlet to protect the 14 gauge wire after it" the answer is no. The GFI against potential ground faults only. It does nothing to protect against circuit over load. Only the breaker protects against over load of the circuit wiring.