[SOLVED] Moode on my Raspberry Pi 3B, shows undervoltage

[TheOldPresbyope]

Actually, 6.2V suggests to me that it is a cheap, no-name "5V" power supply with poor voltage regulatiion. It probably has undersized wires in the interconnecting cable as well. It's the voltage and current delivered at the Pi connector which count.

Get a genuine Raspberry Pi power supply and save a lot of headache.

Regards,
Kent