I managed to carry out the step 8 -> 13
and also step 13 -> 8, if it helps I have the DFOTA files (or ps: wget link)
Is the "luci-proto-modemmanager" package or the "uqmi" package better?
I would like to have an automatic re-connection in case of any anomalies (as you find with modemmanager)?
ps:
wget -c "https://quec-pro-oss.oss-cn-shanghai.aliyuncs.com/fota/9000/Update_EG18EAPAR01A08V05M4G-R01A13M4G_01.200.01.200_V02.zip"