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Iam using TL-MR3020 v1 and TL-MR3020 v3 with modem Sierra Wireless AirCard 320U

Modem detected succesfully, and I can ping other machine from PC attached router.
When using TL-MR3020 v1 system is going well, no RTO and modem IP can ping from outside, but now when using TL-MR3020 v3 i have several RTO and can't ping modem IP.

this is the diagram

Example : modem got IP from ISP

PC 1 ---->Mobile ISP ----> Sierra Modem and TP LINK

when using hardware v1, i can ping Sierra Modem with IP but when using hardware v3, cannot.

here firmware on v3 device

Firmware : Build 170907 Rel. 7338

please help.