hello, “secondary modem unreachable”.
I have tried up and downgrading the firmware, I have reflashed in bootloader mode, factory reset several times.
the first modem has version
ati
Quectel
EG06
Revision: EG06ELAR04A20M4G
however, the second modem does not respond to ati commands and periodically disconnects from usb:
[ 860.155918] option 1-1.2:1.3: device disconnected
[ 873.724057] usb 1-1.2: new high-speed USB device number 31 using xhci-hcd
[ 874.001466] option 1-1.2:1.0: GSM modem (1-port) converter detected
[ 874.001775] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB4
[ 874.007640] option 1-1.2:1.1: GSM modem (1-port) converter detected
[ 874.014038] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB5
[ 874.020514] option 1-1.2:1.2: GSM modem (1-port) converter detected
[ 874.027246] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB6
[ 874.034067] option 1-1.2:1.3: GSM modem (1-port) converter detected
[ 874.040309] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB7
[ 896.465354] usb 1-1.2: USB disconnect, device number 31
[ 896.465891] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 896.469602] option 1-1.2:1.0: device disconnected
[ 896.478383] option1 ttyUSB5: GSM modem (1-port) converter now disconnected from ttyUSB5
[ 896.482493] option 1-1.2:1.1: device disconnected
[ 896.492321] option1 ttyUSB6: GSM modem (1-port) converter now disconnected from ttyUSB6
[ 896.495555] option 1-1.2:1.2: device disconnected
[ 896.503534] option1 ttyUSB7: GSM modem (1-port) converter now disconnected from ttyUSB7
[ 896.508117] option 1-1.2:1.3: device disconnected
would it make sense to try flashing with qfirehose? Which pins should I short for resetting?
The device is 3.5 years old, so probably no guaranteed RMA