Changes since SOA version
IXFR is a zone transfer request that returns changes since a specific SOA version. Enter the SOA version to request changes since then.
Not an apex domain
The domain 6I38VM3N3CDB0RQS79CG5PCNUJP5ANT7.frionline.com.br is not the root of its zone.
Instead, try zone transfer on frionline.com.br .
Instead, try zone transfer on frionline.com.br .