SP flash tool OPENCPU RG620T

Hello, I used SP flash tool to flash my firmware for RG620T, before that I did a readback backup, but it reported an error that it could not be backed up, what is the problem?

I successfully backed up and flashed RG620TEU00AAR03A04G4G_OCPU_AA04_01.001.01.001_V01, but I don’t have the web access password? What is his password?

Hi michael
User:root
PASS:oelinux123

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Hello, if I have backed up files using spfliash, how can I download them back using spliash?

Also, excuse me, is there any one that sends AT commands through the API, and what is its API?