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I tried to follow this method (https://ubuntuforums.org/showthread.php?t=2217416) with no luck. When I put my modem, it always show Mass Storage Mode, here's my lsusb result:

denny@GIGABYTE-PC ~ $ lsusb
Bus 001 Device 009: ID 12d1:15ca Huawei Technologies Co., Ltd. E3131 3G/UMTS/HSPA+ Modem (Mass Storage Mode)

Note here that vid:pid value should be 12d1:1506 then I try modprobe -v option and followed by 

sudo echo "12d1 1506" >/sys/bus/usb-serial/drivers/option1/new_id
bash: /sys/bus/usb-serial/drivers/option1/new_id: Permission denied

No matter what vid:pid that I supplied, system always spouts permission denied. So what's wrong ? and is there easier way to use my USB modem with Ubuntu ?

denny
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  • use echo "thing" | sudo tee file instead of >, or do sudo -i then repeat the command - redirection will not work with sudo – Zanna Sep 18 '16 at 09:13
  • oh no wait... you're trying to write to /sys which isn't a real file system... that "file" might not be writable at all – Zanna Sep 18 '16 at 09:17
  • if you can write to it and it works, you can use sysfsutils to make the change permanent... – Zanna Sep 18 '16 at 09:20
  • after a long research into this: No, I can't write anything into it, sometimes I can but it will be immediately rewritten by Ubuntu. In the end, I just want to surf the net with my USB modem, so I found another way to do that (https://www.youtube.com/watch?v=DF8xI_DM9NY). I just curious why soooo many people suggested this method, it doesn't work for me and I have tested it in my PC, laptop, and my friend's PC, none worked – denny Sep 18 '16 at 11:53

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