We are pleased to announce that Firmware version 8.5.1 is now available for production environments.
This latest firmware update can be downloaded from the Firmware Download page, or you can upgrade your device directly through InControl Firmware Management.
Hello @Lai,
It is worth noting here (and to be corrected in the release notes) that currently excluded hardware from 8.5.1 includes (as per forum thread System lockups on Balance 310 5G on 8.4.0):
We have firmware 8.5.1 working OK with these models where the internal cellular is NOT used (both disabled), though we await a solution for those where the internal cellular modems are getting used.
Please let us know when the new firmware 8.5.1 “Special Release” versions will be available for the Balance 310 5G/Fibre series.
Appreciate your assistance,
Marcus 
@Marcus, can you please create a ticket and allow us to check from your device ? We are not aware of this and it would be best that you can work with us and let us finalizing the issue and post the update.
Hello @sitloongs,
Please refer to the existing (though now closed) Peplink ticket #24111107, which covers the system and current firmware 8.5.1 GA operating on the Peplink Balance 310 5G.
Additionally, there are two currently open tickets, these are Peplink ticket #24030347 and Peplink ticket #23120566 both relating to system lockups on the Peplink Balance 310 5G.
Have a good week,
Marcus