Can you downgrade a ERS4850 on version 6.1 to 4.2.3 ?

[Siobhan_Stynes]

We have an RMA switch that has arrived with 6.1 and we need to downgrade to install in stack of VSP4850 ERS4850's with 4.2.3 software. Can you downgrade this switch ? Or do we need to downgrade - will the V6.1 switch integrate in the 4.2.3 stack ?

EDIT: Corrected switch model

[Hyung_Jin_Kim]

So far, the last version of ERS4850 is 5.12.
I think you seem to mention about VSP. And in VSP, You can not direct downgrade from 6.x to 4.x.

[Federico_Barone]

In general, you could downgrade an ERS, but would loose the configuration. But that would not be an issue for an RMA switch. As mentioned sw 6.x is VSP code and not BOSS. You may have received a VSP4800 instead of an ERS4800. Latest is 5.12.x.

[Jongseok_Won]

There are no v6.1and v4.2.3 for ERS4800. These version codes seem to be for VSP4000.
ERS4800 is under end of sales and the latest version, v5.12.x is recommended to use. For stack, you need to same sofware and firmware for units to form stack. So entire stack should be upgraded.

[Matthew_Palmer]

What are the versions of ERS4850 - because the SW versions you mention above (4.2.3 and 6.1) are both VSP code releases - not ERS4850......