Finally, I got MT300A with K5150 Enterprise to work well:
1.)
nano /usr/lib/rooter/modeswitch.sh
Add after line 264:
if [ $idV = 12d1 -a $idP = 157d ]; then
retval=0
fi
retval=0
2.)
nano <span class=“wcrep2”>/etc/usb-mode.json</span>
Change line 2182 from
“12d1:15e7”
to
“12d1:15ec”
With support from:
https://forums.whirlpool.net.au/forum-replies.cfm?t=2599894&p=60