PPP (LTE\3G) Client doesn't work on any router with os 7.X on huawei e3372 stick

RouterOS General
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I’ve moved on ROS7 again, and PPP is not working on any router that I tesed: HAP AC3, Mikrotik hAP ac lite and RB2011UIAS-RM - os 7.X version with huawei e3372 stick it just wont connet.
On ROS 6 (Tested on diferent versions: some old and latest one and on HAP AC3, Mikrotik hAP ac lite, RB2011UIAS-RM) - everething is working fine…
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2

Info is working fine btw
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Solved, thanks to Artis Bernāts from support@mikrotik.com for helping with that.
The 3g modem e3372h-153 with STICK firmware - sometimes on ROS 7 it sends wrong PPP chanel settings and thats why its not working.

By the these commands i’ve tried manually found the working channel:

/system serial-terminal usb1 channel=0

And for second channel

 /system serial-terminal usb1 channel=1

Checked what modem responds by sending the following commands using serial terminal

        ate1
        ati
        at+cpin?
        at+cfun?
        at+cgdcont?
        at+cgact?
        atd*99#

The last command will trigger ppp connection should return “CONNECT”.
So i figured out that everything is working on 1 channel only not on both 0 and 1.
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Hi, and thank you for the hint.

But how do find the right channel for Data and Info? I assume it’s just coincidence that they are the same for you?

For me, channel=1 answers to all the AT commands but I assume that’s the Info channel, not the data channel right? How do I find out the data channel?