12-27-2017 11:13 PM
We bought four Yoga 370's model: 20JHS02C00 recently and are having issues with the inbuilt celular connections working fine, then just coming up with no SIM errors.
They all have Sierra Wireless EM7430 and we install the latest driver (still 7.47.4743.0105 as at December 27) and they work fine using our Optus SIM's.
However we have had two go from showing the Optus YES icon one minute, to No SIM the next.
There's no drivers to roll back looking in device Manager, looking at the hardware logs only shows the original install logs, swaqpping in another Optus SIM or a Telstra SIM makes no difference, turning cellular off and on again does nothing either.
One of them worked fine, only after re-imaging the machine and starting over from scratch, which we cannot keep doing.
I've done the usual Googling of this issue but I've only seen one response to a Lenovo post, which was send it back for a SIM tray and system board replacement.