# HiFive1 A01 Not Being Detected

**URL:** <https://forums.sifive.com/t/hifive1-a01-not-being-detected/4181>\
**Category:** HiFive1 Rev B\
**Created:** [November 9, 2020, 1:48pm UTC](https://forums.sifive.com/t/hifive1-a01-not-being-detected/4181 "2020-11-09T13:48:06Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![davidpgil](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.sifive.com/davidpgil/32/1179_2.png) [@davidpgil](https://forums.sifive.com/u/davidpgil)\
**Post date:** [November 9, 2020, 1:48pm UTC](https://forums.sifive.com/t/hifive1-a01-not-being-detected/4181/1 "2020-11-09T13:48:06Z")

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I have two of the older HiFive1 A01 – I got very side-tracked and finally started to try to play with it.

I cannot get them to apper via via `lsusb` and `sudo ls /dev/ttyUSB*` – yes I own TWO of these.

What are my options if both of these aren’t detected? Both light up and are being powered by USB.

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**Author:** ![bruce](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.sifive.com/bruce/32/452_2.png) [@bruce](https://forums.sifive.com/u/bruce)\
**Post date:** [November 9, 2020, 11:20pm UTC](https://forums.sifive.com/t/hifive1-a01-not-being-detected/4181/2 "2020-11-09T23:20:17Z")

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That’s weird. Maybe try a different USB cable. I’ve had bad ones. Also I know it’s sacrilege in Linux land (and I’m often unjustifiably proud of my own 200 day or 400 day uptimes) but sometimes I have managed to get my USB ports into weird states after playing with this kind of hardware (including AVR Arduinos) and needed a reboot to fix it.

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**Author:** ![davidpgil](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.sifive.com/davidpgil/32/1179_2.png) [@davidpgil](https://forums.sifive.com/u/davidpgil)\
**Post date:** [November 10, 2020, 12:09am UTC](https://forums.sifive.com/t/hifive1-a01-not-being-detected/4181/3 "2020-11-10T00:09:19Z")

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Interesting – it turns out the 2 USB cables and mini USB hub all don’t work with the HiFive. I switched to other USB cables and now they are detected. Odd! Never seen this before. Thank you!

I did need to reboot in order for the USB to be detected as ttyUSB as well.