@Teresa No I bought one from Banggood and the other from Amazon. I think the problems are all to do with the connectors to the back panel. I have found that applying pressure to the back has gradually allowed the +5V to rise to its proper level, as if the battery is charging. I shall see if the other one has the same problem.

@Teresa These devices are both Black. Both had the same problem when trying to upload a sketch. One of them has since died. Yes I have checked through all the steps shown on github, but still getting time out errors.

This is a brand new M5Stack. On attaching a usb power bank the M5Stack Logo screen appears, then a list of errors:
MPU9250 ERROR
AK8963 ERROR
Wifi RSSI ok
SDCard ERROR
ADC34: Various numbers
ADC35: Various numbers
ADC34: 0000

I have been through the forum entry "Let's start! Hello world"
When I upload the Arduino sketch. I get "....._____" x10 returned, with a communications error message, which I have seen before using a ESP32 chip, that was fixed using the boot/enable button.
Have I got a Hardware problem?
The funny thing is this is the second M5stack that I have bought with exactly the same problem.
I'm pretty sure that I am doing the installation correctly.
Am I just unlucky, stupid or is there an generic M5stack problem