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RE: DELL VOSTRO 3250 USB not work Legacy mode ko

as I  wrote  is impossible reset to UEFI  mode  because the  PC are unusable:   BLACK  SCREEN,

no DELL logo, no BIOS access F2....    I tried  also with jumper reset   CMOS and remove battery, nothing,  black screen ....

I have a lot of Vostro 3250 but I can't crash all , for the moment 2  PC are ko  after   I set  "LEGACY MODE"    

the usb issue is a secondary problem....

the pendrive/hdd are 2.0  works on  other pc and rear port  

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