@JoshRebello I'm sorry, I don't remember the value.

@JoshRebello We solved this issue with an RMA, motherboard was damaged according to the RMA report.

@tom I tried it extensively with different cables/ports/computers during today with no result.

@tom Definitely not on the VOXL 2, I checked it beacause of the output of lsusb that I showed previously.
Add-on board? Is there another switch on the 5G board or one of the Sentinel boards? I think that is a very unlikely scenario, the drone was working one day and the next it wasn't, without any changes.

@Adrian-Hidalgo The LEDs are always solid green.
Did what you suggested, but the install script didn't work. Got this:

Installer Version: 0.8
Image Version:     1.5.5
[ERROR] No device found in adb or fastboot
[INFO] Failed to put device in fastboot mode, exiting

@Chad-Sweet Ok, thank you for clarifying!

@Adrian-Hidalgo We have been powering the drone only with batteries, never used an external power supply.
On our last tests, we were using only the services already available on the VOXL 2. With a minor modification to the voxl-tag-detector service, to use the front stereo pair, instead of the tracking camera.

Hello,

Our Sentinel drone was working yesterday when we left work, but this morning it wouldn't boot: no Wi-Fi network, no devices listed with adb devices, lights on the ESC don't stay on after the first seconds, and no lights on the GPS sensor.
The LEDs on the VOXL 2 main board and 5G board all seem to be on their normal state.

I think it is important to say that, at this point, lsusb was outputting:

Bus 004 Device 004: ID 05c6:9008 Qualcomm, Inc. Gobi Wireless Modem (QDL mode)

, and not something like Bus 004 Device 033: ID 05c6:901d Qualcomm, Inc. KONA-QRD _SN:FDF5950D as we were expecting from seeing this post. We found the QDL mode part to be a little bit odd, but please confirm if this is normal for a Sentinel drone that was unaltered (HW and SW).

After discovering this, we removed the VOXL2 board from the drone and tested fastboot.
For this, we carefully followed all the steps on this tutorial, but no devices were listed by the fastboot devices command.

Since this was also not working, we followed the VOXL 2 QDL Guide to try and flash the VOXL2 QDL Image 14.1a_1.1.2. What we got was:

andre@andre:~/1.1.2-M0054-14.1a-FLAT-V3/ufs$ sudo qdl --debug --storage ufs --include . prog_firehose_ddr.elf rawprogram_unsparse0.xml rawprogram1.xml rawprogram2.xml rawprogram3.xml rawprogram4.xml rawprogram5.xml patch0.xml patch1.xml patch2.xml patch3.xml patch4.xml patch5.xml
Waiting for EDL device
HELLO version: 0x2 compatible: 0x1 max_len: 1024 mode: 0
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END OF IMAGE image: 13 status: 0
DONE status: 1
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: Binary build date: Aug 17 2021 @ 23:37:37" /></data>
LOG: INFO: Binary build date: Aug 17 2021 @ 23:37:37
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: Binary build date: Aug 17 2021 @ 23:37:37
" /></data>
LOG: INFO: Binary build date: Aug 17 2021 @ 23:37:37 
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: Chip serial num: 1794324607 (0x6af3387f)" /></data>
LOG: INFO: Chip serial num: 1794324607 (0x6af3387f)
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: Supported Functions (15):" /></data>
LOG: INFO: Supported Functions (15):
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: program" /></data>
LOG: INFO: program
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: read" /></data>
LOG: INFO: read
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: nop" /></data>
LOG: INFO: nop
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: patch" /></data>
LOG: INFO: patch
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: configure" /></data>
LOG: INFO: configure
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: setbootablestoragedrive" /></data>
LOG: INFO: setbootablestoragedrive
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: erase" /></data>
LOG: INFO: erase
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: power" /></data>
LOG: INFO: power
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: firmwarewrite" /></data>
LOG: INFO: firmwarewrite
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: getstorageinfo" /></data>
LOG: INFO: getstorageinfo
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: benchmark" /></data>
LOG: INFO: benchmark
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: emmc" /></data>
LOG: INFO: emmc
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: ufs" /></data>
LOG: INFO: ufs
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: fixgpt" /></data>
LOG: INFO: fixgpt
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: getsha256digest" /></data>
LOG: INFO: getsha256digest
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: End of supported functions 15" /></data>
LOG: INFO: End of supported functions 15
qdl: firehose operation timed out
FIREHOSE WRITE: <?xml version="1.0"?>
<data><configure MemoryName="ufs" MaxPayloadSizeToTargetInBytes="1048576" verbose="0" ZLPAwareHost="1" SkipStorageInit="0"/></data>

FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: Calling handler for configure" /></data>
LOG: INFO: Calling handler for configure
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: Storage type set to value UFS" /></data>
LOG: INFO: Storage type set to value UFS
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<response value="ACK" MemoryName="UFS" MinVersionSupported="1" Version="1" MaxPayloadSizeToTargetInBytes="1048576" MaxPayloadSizeToTargetInBytesSupported="1048576" MaxXMLSizeInBytes="4096" DateTime="Aug 17 2021 - 23:37:37" /></data>
[CONFIGURE] max payload size: 1048576
FIREHOSE WRITE: <?xml version="1.0"?>
<data><program SECTOR_SIZE_IN_BYTES="4096" num_partition_sectors="32776" physical_partition_number="0" start_sector="3154440" filename="qti-ubuntu-robotics-image-qrb5165-rb5-sysfs_1.ext4"/></data>

FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="INFO: Calling handler for program" /></data>
LOG: INFO: Calling handler for program
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="ERROR: Failed to initialize (open whole lun) UFS Device slot 0 partition 0" /></data>
LOG: ERROR: Failed to initialize (open whole lun) UFS Device slot 0 partition 0
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="ERROR: Failed to open the device:3 slot:0 partition:0 error:0" /></data>
LOG: ERROR: Failed to open the device:3 slot:0 partition:0 error:0
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="ERROR: OPEN handle NULL and no error, weird 344489460" /></data>
LOG: ERROR: OPEN handle NULL and no error, weird 344489460
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<log value="ERROR: Failed to open device, type:UFS, slot:0, lun:0 error:3" /></data>
LOG: ERROR: Failed to open device, type:UFS, slot:0, lun:0 error:3
FIREHOSE READ: <?xml version="1.0" encoding="UTF-8" ?>
<data>
<response value="NAK" rawmode="false" /></data>
[PROGRAM] failed to setup programming

Or sometimes, after this, the command would run instantly but with no console output.

We are having a lot of difficulties figuring out what went wrong. Hope you can help us.

@Vinny Ok, I'm still waiting.

@JustinDev23 You can have GPS fix and not have GPS lock on the PX4. Have you checked the number of satellites on QGC? From my experience, GPS lock (required to switch to Position mode) is achieved with 12 satellites or more.
Maybe test the drone on a new location with more open space, that did the trick for me.