BleError: Characteristic b8***** issue on RAK V2 miner

Hi there
I have an issue with my miner and stops mining with that cryptic error. The hotspot is alive but It is not mining and therefore not responding beacons neither data traffic.

Does anyone have a clue about this issue and how to solve it? Thanks in advance

By the way, from where I can download the firmware?

Current firmware: 2023.04.18.1
Maker: CalChip