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Paper Tape
Posts: 1
Registered: ‎05-01-2016
Location: US
Views: 3,553
Message 1 of 3

Flex 3 15 Can't boot from USB

For some reason, my new laptop cannot boot from any USB drive, (any Linux ISO, or even a Windows Drive). I have disabled Secure boot, enabled legacy support, moved all of the USB options in the boot order to the lop of the list, and I've gotten nothing. Anybody got any ideas?

Retired Support Specialist
Posts: 3,772
Registered: ‎12-24-2015
Location: IN
Views: 3,518
Message 2 of 3

Re: Flex 3 15 Can't boot from USB

Welcome to the Forums Wevan! 


Prepping a flash drive to boot in UEFI mode is pretty simple:  Single FAT32partition.  Copy the contents of your Install ISO (or DVD) to the flash drive. If you are using an ISO, something like 7zip will do a nice job of un-archiving the ISO to flash.


Anyway, that's all.  Just boot it.


For legacy mode the prep is different.  NTFS partition set active.  You can use DISKPART for that:  list disk, select, clean, create partition primary, active, format quick fs=NTFS, assign.  Then copy the contents of your boot media as above.


Let us know if it helps.




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What's DOS?
Posts: 1
Registered: ‎08-03-2016
Location: US
Views: 3,274
Message 3 of 3

Re: Flex 3 15 Can't boot from USB

the previous reply is probably correct but you can get the step-by-step directions in Lenovo tech document HT078684.

Follow the steps and you will create a  USB flash drive that is recognized by the BIOS and shows up as a boot option in the NOVO recovery process.  You will then have to put the OS image on it.

I just went through this with my new Ideapad Flex 4-1470 with the INSYDEH20 BIOS.

I spent hours trying to make the BIOS recognize an optical USB boot drive with no success, even though it said I had defeated Secure Boot and enabled USB boot.


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