# Unbricking

Source: https://forum.modalai.com/topic/3929/unbricking
Category: Development Drones (https://forum.modalai.com/category/44/development-drones)
Tags: sentinel
Posted: 2024-11-12 20:14:47 UTC by spiff
Replies: 7 · Views: 1555

## spiff · 2024-11-12 20:14:47 UTC

I received a new Sentinel drone but haven't been able to connect from my (Ubuntu 24) machine via adb, and lsusb also doesn't show the device. Per the [unbricking guide](https://docs.modalai.com/voxl2-unbricking/#ubuntu-host-up-to-ubuntu-version-2004) I opened the flight lid, flipped SW2, and attempted to use the QDL tool to flash the device, but I'm getting an error on the first "Provision" step -- the frontend throws this error:
```
Provisioning UFS...
Failed to provision UFS
```
and the terminal shows:
```
[12/Nov/2024 19:30:07] "GET /get-flat-builds/ HTTP/1.1" 200 28
Internal Server Error: /provision-ufs/
[12/Nov/2024 19:30:08] "POST /provision-ufs/ HTTP/1.1" 500 39
```

## Reply by tom (ModalAI staff) · 2024-11-12 21:26:06 UTC

@spiff If lsusb isn't showing the device it's likely either a cable or power issue and not a bricked drone. Are you running Ubuntu 24 natively or are you using a virtual machine?

## Reply by spiff · 2024-11-12 21:36:35 UTC

I'm running Ubuntu natively on my laptop. I've tried a couple different USB cables, but I will try another. The drone is powered by the AC adapter.

## Reply by tom (ModalAI staff) · 2024-11-12 22:11:11 UTC (in reply to spiff)

@spiff We've seen some weird cases where ADB has issues when using USB-C to USB-C cables. If that is the case people have had success using a USB-C dock with USB-A ports

## Reply by spiff · 2024-11-13 14:50:52 UTC (in reply to tom)

@tom I've tried a few cables, all USB-C to USB-A, but I'm getting the same provisioning error. Does the QDL tool have any other logs I can look at to determine the issue?

## Reply by tom (ModalAI staff) · 2024-11-13 19:39:24 UTC (in reply to spiff)

@spiff Does it not show up with `lsusb` regardless of whether the switch is on or not?

If it's not being in `lsusb` then QDL isn't going to be able to see it so won't be providing an data

## Reply by spiff · 2024-11-13 20:14:14 UTC (in reply to tom)

@tom Ah, I do see this! Maybe there was a cable issue:
```
Bus 001 Device 034: ID 05c6:9008 Qualcomm, Inc. Gobi Wireless Modem (QDL mode)
```

This is with the switch ON, though I'm still getting the provisioning error.

## Reply by tom (ModalAI staff) · 2024-11-13 20:32:57 UTC (in reply to spiff)

@spiff And if you turn it off and power cycle does it show up with `lsusb`?