Probably your modem doesn't support mode switching with AT^SYSCFG then...
I just found some manual [1], the command need an '?' after it, thus should be
'AT^SYSCFG?'.
[1] http://www.letswireless.com.cn/cn/down/download.asp?id=81&t=en ,
section 10.6 on page 43
Yeah, we know that. We actually use already AT^SYSCFG? for loading of
the currently allowed modes, and AT^SYSCFG=something to update it.
Speaking of which, the same AT^SYSCFG is used for band and mode
selection, and we seem to be hardcoding one of the values when
requesting to modify the other. I added a task in the TODO file at git
master to try to fix that; this is, when modifying the band use the
current mode and when modifying the mode use the current band.
Cheers,
--
Aleksander
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