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Where is your bios post here.
Upload Original file i fix new.
Upload old and original bios i add dmi information.
Yes you are right.
Not bios problem check usb port is ok .if any hardware damage hang startup log.
Try this.
Unavailable BV
Thanx i have all asus password generator tools.
your luck.
Here try this. https://vinafix.com/threads/ziwb2-ziwb3-ziwe1-la-b091p-r10-0210-r1-0-0212-dis.13706/
Here try this.
You send me 1 pics back cover service tag number and model and post main pch bios i find ec bios.
Above have.
Try this and reply.
Post board code.
Press alt/r show rescue password send date i send password.
Try this. https://vinafix.com/threads/dell-xps-17-l702x-quanta-gm7c.7360/