the file is under 755 permission

What group is it?  Often, write access to a device by an unprivileged user is achieved by making the device group-writable (775 or 664) and having the user belong to that group.  (That's usually preferred to making the device world-writable (like 777 or 666).)

In reply to Re: GSM problem by almut
in thread GSM problem by roc

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