# How to use Huawei 3372s under linux


https://www.0xf8.org/2017/01/flashing-a-huawei-e3372h-4g-lte-stick-from-hilink-to-stick-mode/

## How to flash

1. `sudo ./balong-usbdload -p /dev/ttyUSB0 usblsafe-3372h.bin` DO NOT
   TOUCH the usb key, you should see 3 new tty poping
2. `sudo ./balong_flash -p /dev/ttyUSB2 Huawei_E3372h-153_21.180.01.00.00_Firmware_general_3Ginfo.ru/E3372h-153_UPDATE_21.180.01.00.00.BIN`


* [See the fuck here with linux drivers](https://askubuntu.com/questions/816974/huawei-usb-modem-proper-drivermodule-is-not-loading/818374#818374)

https://wiki.dd-wrt.com/wiki/index.php/Cellular_Phone/USB_Modem_as_WAN_connection

https://openwrt.org/docs/guide-user/network/wan/wwan/ethernetoverusb_ncm

1. Delete old /dev/ttyUSBx can save your life
1. Doing a `rmmod option` can solve a lot


1. You should have `usb-devices`

```
T:  Bus=01 Lev=01 Prnt=01 Port=06 Cnt=03 Dev#= 68 Spd=480 MxCh= 0
D:  Ver= 2.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=12d1 ProdID=1506 Rev=01.02
S:  Manufacturer=HUAWEI_MOBILE
S:  Product=HUAWEI_MOBILE
C:  #Ifs= 5 Cfg#= 1 Atr=80 MxPwr=2mA
I:  If#=0x0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=02 Prot=12 Driver=option
I:  If#=0x1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=02 Prot=01 Driver=option
I:  If#=0x2 Alt= 1 #EPs= 3 Cls=ff(vend.) Sub=02 Prot=16 Driver=huawei_cdc_ncm
I:  If#=0x3 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
I:  If#=0x4 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
```

1. `ip link` must show a device like `wwx00XXXXXXXXX`

1. To enable connection
1. `socat - /dev/ttyUSB0,crnl`
1. `ATI` show basic informations
1. `AT+CPIN=1234` if you have a pin code
1. `AT+CGDCONT=1,"IP","m2m.tele2.com"` for setup a APN
1. `AT^NDISDUP=1,1,` to enable APN should show => `^NDISSTAT:1,,,"IPV4"`
1. Then you enable wwx iface with `ip link set up wwx00XXXXXXXXX`
1. Then send shcp request `dhclient -v wwx00XXXXXXXXX`

## On DDWRT

1. Usb drivers debug helpful command `cat /sys/kernel/debug/usb/devices`
1. You need to load kernel module first `insmod cdc-ncm.ko cdc_wdm.ko huawei_cdc_ncm.ko usb_wwan.ko option.ko` TODO finish this
1. Switch the Huawei in modem mode `usb_modeswitch -v 0x12d1 -p 0x14fe -J`
1. You should see a change in `lsusb`
1. You should see `wwan0: register 'huawei_cdc_ncm' at usb-0000:00:0b.1-2, Huawei CDC NCM device, 00:1e` in `dmesg` command output
1. Enable connection `echo -ne "AT^NDISDUP=1,1,\"sl2sfr\"\r\n" > /dev/ttyUSB0`
1. `ifconfig wwan0 up` see this documentation here
1. `udhcpc -i wwan0`
1. `iptables -t nat -A POSTROUTING -o wwan0 -j MASQUERADE`
1. `iptables -A FORWARD -i br0 -j ACCEPT`
1. `iptables -t mangle -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu`