# Extract private key
openssl pkcs12 -in YOUR_CERTS.pfx -nocerts -out privateKey.pem

# Extract public certs
openssl pkcs12 -in YOUR_CERTS.pfx -clcerts -nokeys -out publicCert.pem

# create new certificate
openssl pkcs12 -inkey privateKey.pem -in publicCert.pem -export -out YOUR_CERT_v1.pfx