Starting with ExtremeXOS 30.6, option 66 and option 67 for Zero Touch Provisioning (ZTP) are supported, which provide TFTP server and bootpfilename for cases when option 43 is not available.
ExtremeSwitching X435, X440-G2, X450-G2, X460-G2, X465, X590, X620, X670-G2, X690, X695, X870 series switches.