NETGEAR is aware of a problem with jumbo frame support on a limited quantity of XS505M and XS508M switches.
If your XS505M or XS508M does not support jumbo frames correctly and has a serial number within the potentially affected range, contact NETGEAR Support for assistance.
Potentially affected serial number range for XS505M:
Serial numbers with a 7 in the position highlighted below might be affected:

Potentially affected serial number range for XS508M:
Serial numbers with a 7 in the position highlighted below might be affected:
