B
Ah, here is the reason. "WiPy2, SiPy, and LoPy1 and are not supported anymore since they only have 4MB flash." That was unexpected because the latest non-beta firmware works fine, but I knew this was coming some day.
Also, "No OTA support from Pybytes yet"
I tried with the updater and it says, "Your hardware is not supported by this firmware package"
https://forum.pycom.io/topic/7016/new-beta-release-v1-20-3-b3