# Unable to detect mangOH Green **URL:** \ **Category:** mangOH Green\ **Created:** [September 4, 2017, 3:26pm UTC](https://mangoh.discourse.group/t/unable-to-detect-mangoh-green/718 "2017-09-04T15:26:56Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![lyao](https://avatars.discourse-cdn.com/v4/letter/l/e8c25b/32.png) [@lyao](https://mangoh.discourse.group/u/lyao)\ **Post date:** [September 4, 2017, 3:26pm UTC](https://mangoh.discourse.group/t/unable-to-detect-mangoh-green/718/1 "2017-09-04T15:26:56Z")
Hi all, I have a mangOH Green REV 8 with WP8548 installed. Now I cannot detect the device on my Linux laptop. The led 1 and 12 are on. But no usb device can be detected on my laptop. I power cycled the device several times, after which the connection succeeded once. Then the connection failed when I tried to re-install the firmware. After that I cannot detect the device any more again. I connected with my laptop via USB. I will try with the serial port when I get a serial-to-usb cable. Any idea how this can happen, and how I can debug it? Thx a lot. ---
**Author:** ![asyal](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/asyal/32/78_2.png) [@asyal](https://mangoh.discourse.group/u/asyal)\ **Post date:** [September 4, 2017, 5:56pm UTC](https://mangoh.discourse.group/t/unable-to-detect-mangoh-green/718/2 "2017-09-04T17:56:01Z")
There a few people with same question as this. Can you 👀 through previous forum posts to see if that helps? ---
**Author:** ![lyao](https://avatars.discourse-cdn.com/v4/letter/l/e8c25b/32.png) [@lyao](https://mangoh.discourse.group/u/lyao)\ **Post date:** [September 5, 2017, 8:32am UTC](https://mangoh.discourse.group/t/unable-to-detect-mangoh-green/718/3 "2017-09-05T08:32:26Z")
Yeah of course, sorry Ashish. This morning I took out the chip and then re-installed it then everything works fine again.