I've been trying for months to get the WIFI working on my EVSE. It had an old firmware originally. I think one of the 1.0 versions. Despite not having most of the newer features, it seemed to work good the year before. . I updated it to 2.5.2 several months ago when that was the latest version. It wouldn't see any WIFI networks once I did that. I rewrote the firmware thru USB-serial and it still wouldn't see any network. There 10-15 WIFI AP's in range. I tried 2.7.4 today, which it seemed to take (I got OK and now it shows that version on the System tab) and now not only do I still not see any networks, but the unit seems to reboot often. I tried downgrading to 2.7.2 but it won't stay online long enough to take the firmware.
Is this typical for the recent WIFI versions or do I maybe have a defective unit?
It sounds like you may have a corrupted upload. Can you write 2.7.4 with the USB-Serial?
esptool.py -b 1500000 -p COM4 write_flash 0x000000 firmware.bin
We would reccomend a full erase first.
esptool.py -b 1500000 -p COM4 erase_flash
Substitute COM4 with your COM port
Yes, it does indeed sound like a corrupted unit. 2.7.4 has been totally stable on all the units that's it;s been testing on. What ESP WiFi device are you using? Is it the Adafruit Huzzah with the standard power supply?
Doing a full erase before uploading as Chris suggested is good idea.