When you have a court appointed representative you only attach the court certificate. Do not fill out 1310.

1310 instructions.

 Who Must File. If you are claiming a refund on behalf of a deceased taxpayer, you must file Form 1310 if: • You are NOT a surviving spouse filing an original or amended joint return with the decedent; and • You are NOT a personal representative (defined later) filing, for the decedent, an original Form 1040, 1040-SR, 1040A, 1040EZ, 1040NR, or 1040-NR that has the court certificate showing your appointment attached.

Here is a link. chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.irs.gov/pub/irs-pdf/f1310.pdf