Hi, I got similar problem with my WIO Terminal with the following error:
…
Cannot initialize ESP-AT Lib!
Attempting to connect to SSID: xxxxxxx
[E][esp_event_loop.c:99] at_unified_cb(): at_unified evt: 4
[E][WiFiGeneric.cpp:477] mode(): Could not set mode! -1
[E][WiFiSTA.cpp:107] begin(): STA enable failed!
I have reloaded RTL8720 (https://files.seeedstudio.com/wiki/Wio-Terminal/res/20200730-rtl8720d-images-v2.2.0.2.zip) but problem still error.
Any suggestion to resolve theses?