Kernel fails to identify the serial ports

I compiled the kernel, following the instructions in Quectel_WCDMA&LTE_Linux_USB_Driver_User_Guide_V1.9_Preliminary_20190325

Still the kernel fails to identify the serial ports

Can you instruct us on what to do?

See more details below:

1 . We add to serial.c
#if 1 //Added by Quectel
{ USB_DEVICE(0x05c6, 0x9090) }, /* Quectel UC15 /
{ USB_DEVICE(0x05c6, 0x9003) }, /
Quectel UC20 /
{ USB_DEVICE(0x2c7c, 0x0125) }, /
Quectel EC25 /
{ USB_DEVICE(0x2c7c, 0x0121) }, /
Quectel EC21 /
{ USB_DEVICE(0x05c6, 0x9215) }, /
Quectel EC20 /
{ USB_DEVICE(0x2c7c, 0x0191) }, /
Quectel EG91 /
{ USB_DEVICE(0x2c7c, 0x0195) }, /
Quectel EG95 /
{ USB_DEVICE(0x2c7c, 0x0306) }, /
Quectel EG06/EP06/EM06 /
{ USB_DEVICE(0x2c7c, 0x0512) }, /
Quectel EG12/EP12/EM12/EG16/EG18 /
{ USB_DEVICE(0x2c7c, 0x0296) }, /
Quectel BG96 /
{ USB_DEVICE(0x2c7c, 0x0435) }, /
Quectel AG35 */
#endif

  1. But still when power on the board i get

cat /sys/kernel/debug/usb/devices

Bus=03 Lev=02 Prnt=02 Port=03 Cnt=03 Dev#= 5 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=2c7c ProdID=0125 Rev= 3.18
S: Manufacturer=Quectel
S: Product=EG25-G
C:* #Ifs= 5 Cfg#= 1 Atr=a0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E: Ad=83(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E: Ad=85(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)
E: Ad=87(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
E: Ad=89(I) Atr=03(Int.) MxPS= 8 Ivl=32ms
E: Ad=88(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

kernel version:

5.10.72-00018-g54805099f423-dirty

run these two these commands to try.
modprobe -r option
modprobe option