Hello @TP-Link @Sunshine @Kevin_Z 

I'm unable to update my TP-Link M3750 Version 5 firmware as I encounted error message below:

The MiFi firmware version that I have is as below:

I got this second hand from an online reseller. There is a DiGi logo on the front of the device.

Is there any way to upgrade to latest firmware as I intend to use other telco since my area coverage for DiGi is very poor. I saw in another thread that it's possible to flash the original firmware? Otherwise I will have no other use for this device and will have to throw it.

Thanks in advance.