GL-MiFi schematics

Can anybody share schematics for the old version of GM-MiFi? My motherboard is GLZT_MIFI_V2.5.0
I want to repair the modem issue, but I need schematics.

Sorry there is not schematics.

You can tell your detailed issues so that we can see how to help.

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There was an issue when due to low cellular signal, MIFI rebooted. So I removed U12 (3.3v power for modem) and connected this Pololu S7V8F3 3.3v regulator to L2 directly from the battery instead. And then connected 3.3v from the UART connector to use it as a shutdown trigger for the regulator when the router is off.
The problem is solved now.