As mentioned J9851A,
1. Please find firmware link, the latest
KB.16.10.0016 03-Aug-2021 10-Aug-2021
My Networking | HPE® Official Site
2. 3rd Party transceiver before added check the transceiver compatibility matrix
3. Which 3rd party transceiver, you want to connect?
Does anyone have a definative answer on what the latest version that allows this feature is?
Still I do not see this type of the feature after firmware upgrade, 3rd Party transceiver works.
For more information, based on Aruba.
https://www.arubanetworks.com/assets/support/FAQ_Unsupported-Transceiver-Mode-CX.pdf