Anyone using one of the latest Huawei E5576-320?

I got this today from Amazon UK and I havent seen much activity with this on openwrt or linux. 2020 model?
4G worked fine via USB (usb ether) I didnt do anything special apart from installing a number of kmods from the wiki.
I was using a QMI based modem before so I had things half done already on my openwrt.

I have two questions as Im not really experienced with 4G modems.
a) Has anyone tested a similar version as below with changing to serial mode? How did you do it? Did the "way back" to normal mode worked?
b) Not openwrt related but if anyone know a working way to disable the battery check? The AT commands from 5573 didnt work for me.


Device name E5576-320
Hardware version CL1E5576M_A02
Software version
Web UI version WEBUI
Configuration file version E5576-320-CUST [](C1217)