Huawei E5186 Router

RouterOS Wireless Networking
1

Any router can replace that but you will need a LTE modem.

2

Personally, I’d go for either the RB912UAG-2HPnD or RB922UAGS-5HPacD.

3

if you could send supout we can check if we can add support for e3372.

For Stable 4G Mikrotik i alo sugest RB922 Plus Sierra Wireless MC7710 / Huawei - ME909u-521