Understand, you can't use just any flash drive. The flash drive itself has to be "bootable capable". NOT be bootable because you did use the s/w that boots what you need. I hope you realize you need to verify that the flash drive you're using, check it's manufacturer specs of that bootable capacity. If it is capable, you can then use the restore image s/w to make the required bootable partition for its use, to be 100% ready. The manual clearly explains this in the HP110 restore process. The manual also provided you did now have a bootable flash drive that the restore process will take hrs. to complete, so be patient.
>>>> from manual:
You will need the following before you begin this restore process:
o- A 2-GB (minimum) USB flash drive (purchased separately)
NOTE: This USB flash drive should have bootable capability. Refer to the USB flash drive
manufacturer for additional information.
o- An additional computer running either a Windows® or Linux operating system
To perform this restore option, you download the HP Mi Restore Image Creator utility and Mini operating
system onto another computer and then transfer the necessary files to the USB flash drive. The drive
can then be used to reboot your device and restore the system.
tada -----Willy 
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