We open the ledger nano s revision 7 device and make sure the PCB is not tampered or modified by hackers. lets check the hardware integrity.
Just get a knife or a flat screw. make sure it is thin so you can pop up the back of the ledger.once open. compare the PCB from the official ledger nano website. https://support.ledger.com/hc/en-us/articles/115005321449-Check-hardware-integrity
In this ledger, the PCB is revision 7. make sure there are no additional chips soldered on your ledger. if everything is good. update your ledger nano s firmware to the newest version. you can do this with the help of Ledger Live software. make sure you download the software from the official ledger website.
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