Try to flash from qFlipper in DFU mod, try from file qFlipper is crash, try update from release -
flipper FZ.1
[RCY] Co-Processor Firmware Download ERROR: Can’t start FUS: Failed to get FUS state.
[DEF] “Co-Processor Firmware Download” failed with reason: “Can’t start FUS: Failed to get FUS state.” Attempting to install the firmware anyway…
ERROR: Can’t flash firmware: An error has occurred during the operation.