EC25 DHCP Problem with Embedded Busyboxy board

IoT Modules LTE Standard Module
6

We used the newer version of the Quectel-CM, based on the advices in this post, nevertheless no change! Still we cannot get IP.
Unfortunately this is not only our problem. Others like this and this post have had similar problems, yet no solution!

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quectel-CM
[06-19_15:48:23:856] WCDMA&LTE_QConnectManager_Linux&Android_V1.1.45
[06-19_15:48:23:869] /mnt/quectel-CM profile[1] = (null)/(null)/(null)/0, pincode = (null)
[06-19_15:48:23:906] Find /sys/bus/usb/devices/1-1 idVendor=2c7c idProduct=0125
[06-19_15:48:23:907] Find /sys/bus/usb/devices/1-1:1.4/net/wwan0
[06-19_15:48:23:908] Find usbnet_adapter = wwan0
[06-19_15:48:23:931] Find /sys/bus/usb/devices/1-1:1.4/usb/cdc-wdm0
[06-19_15:48:23:931] Find qmichannel = /dev/cdc-wdm0
[06-19_15:48:24:008] cdc_wdm_fd = 7
[06-19_15:48:25:031] QmiThreadSendQMITimeout pthread_cond_timeout_np=110, errno: 2 (No such file or directory)
[06-19_15:48:26:111] Get clientWDS = 19
[06-19_15:48:26:144] Get clientDMS = 1
[06-19_15:48:26:176] Get clientNAS = 3
[06-19_15:48:26:207] Get clientUIM = 1
[06-19_15:48:26:239] Get clientWDA = 1
[06-19_15:48:26:272] requestBaseBandVersion EC25EFAR02A03M4G 1 [Aug 05 2016 04:00:00]
[06-19_15:48:26:402] requestGetSIMStatus SIMStatus: SIM_READY
[06-19_15:48:26:432] requestGetProfile[1] mcinet///0
[06-19_15:48:26:464] requestRegistrationState2 MCC: 432, MNC: 11, PS: Attached, DataCap: LTE
[06-19_15:48:26:496] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[06-19_15:48:26:559] requestRegistrationState2 MCC: 432, MNC: 11, PS: Attached, DataCap: LTE
[06-19_15:48:26:624] requestSetupDataCall WdsConnectionIPv4Handle: 0x8799a580
[06-19_15:48:26:687] requestQueryDataCall IPv4ConnectionStatus: CONNECTED
[06-19_15:48:26:720] ifconfig wwan0 up
[06-19_15:48:26:815] busybox udhcpc -f -n -q -t 5 -i wwan0
udhcpc: started, v1.31.1
[06-19_15:48:28:709] Setting IP address 0.0.0.0 on wwan0
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: no lease, failing
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We are still waiting for any help from anyone; including but limited to @Kyson, @WillieYao-Q, @mortezaaliahmadi, @Sukru_Bahadir_Arslan, @jerry, @jitenshap, and @tigerxy who have had similar experiences.
Thanks