BIOS Lenovo Thinkpad Beep Codes

Viking

Viking

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Hi All,

Lenovo introduced their Android App to decode Thinkpad Beep codes using DTMF.
However, my T470 fails to boot and gives 4 consecutive beeps (not DTMF), then it makes a second attempt to boot and gives 2 consecutive beeps.
These beep codes are not detected by the App (because it is not DTMF), and I have not been able to find any explanation anywhere as to the meaning of this beeps.
Does anyone have a link or an overview of the Lenovo Thinkpad non-DTMF Beep codes?
 
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