[G2 Q&A, Help & Troubleshooting] scandiun:
When trying to change to bootloader to kitkat using the file "BLChanger-d802_5_6-nevax-2.3.2-signed.zip" I got a brick on the D802. Can't enter into recovery or download or operating system. The screen stays on but black, and when I connect the phone to the computer to restore the partitions with dd it does a bootloop that stops as soon as I disconnect it from the usb port. I'm following this thread:

http://xdaforums.com/showthread.php?t=2582142

It's very weird that the g2 reboots continuously when connected to the computer but doesn't when not. I can't effectively restore the partitions with dd. This is the log:

Jun 8 12:67:08 ubuntu kernel: [ 3950.009662] usb 2-1.2: new high-speed USB device number 101 using ehci-pci
Jun 8 12:67:08 ubuntu kernel: [ 3950.102338] usb 2-1.2: config 1 has an invalid interface number: 20 but max is 1
Jun 8 12:67:08 ubuntu kernel: [ 3950.102346] usb 2-1.2: config 1 has no interface number 1
Jun 8 12:67:08 ubuntu kernel: [ 3950.103273] usb 2-1.2: New USB device found, idVendor=05c6, idProduct=9006
Jun 8 12:67:08 ubuntu kernel: [ 3950.103279] usb 2-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Jun 8 12:67:08 ubuntu kernel: [ 3950.103284] usb 2-1.2: Product: QHSUSB__BULK
Jun 8 12:67:08 ubuntu kernel: [ 3950.103287] usb 2-1.2: Manufacturer: LG Electronics Inc.
Jun 8 12:67:08 ubuntu kernel: [ 3950.103291] usb 2-1.2: SerialNumber: 1234567890ABCDEF
Jun 8 12:67:08 ubuntu kernel: [ 3950.103897] usb-storage 2-1.2:1.20: USB Mass Storage device detected
Jun 8 12:67:08 ubuntu kernel: [ 3950.104048] scsi host1324: usb-storage 2-1.2:1.20
Jun 8 12:67:08 ubuntu mtp-probe: checking bus 2, device 101: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2"
Jun 8 12:67:08 ubuntu mtp-probe: bus: 2, device: 101 was not an MTP device
Jun 8 12:67:09 ubuntu kernel: [ 3951.101623] scsi 1324:0:0:0: Direct-Access Qualcomm MMC Storage 1.00 PQ: 0 ANSI: 2
Jun 8 12:67:09 ubuntu kernel: [ 3951.102042] sd 1324:0:0:0: Attached scsi generic sg4 type 0
Jun 8 12:67:09 ubuntu kernel: [ 3951.102658] sd 1324:0:0:0: [sde] 61071360 512-byte logical blocks: (31.2 GB/29.1 GiB)
Jun 8 12:67:09 ubuntu kernel: [ 3951.103273] sd 1324:0:0:0: [sde] Write Protect is off
Jun 8 12:67:09 ubuntu kernel: [ 3951.103278] sd 1324:0:0:0: [sde] Mode Sense: 0f 0e 00 00
Jun 8 12:67:09 ubuntu kernel: [ 3951.103909] sd 1324:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Jun 8 12:67:09 ubuntu kernel: [ 3951.115090] sde: sde1 sde2 sde3 sde4 sde5 sde6 sde7 sde8 sde9 sde10 sde11 sde12 sde13 sde14 sde15 sde16 sde17 sde18 sde19 sde20 sde21 sde22 sde23 sde24 sde25 sde26 sde27 sde28 sde29 sde30 sde31 sde32 sde33 sde34 sde35 sde36
Jun 8 12:67:09 ubuntu kernel: [ 3951.120388] sd 1324:0:0:0: [sde] Attached SCSI disk
Jun 8 12:67:09 ubuntu kernel: [ 3951.169892] usb 2-1.2: USB disconnect, device number 101
Jun 8 12:67:09 ubuntu kernel: [ 3951.173185] sd 1324:0:0:0: [sde] Synchronizing SCSI cache
Jun 8 12:67:09 ubuntu kernel: [ 3951.173221] sd 1324:0:0:0: [sde] FAILED Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Jun 8 12:67:09 ubuntu kernel: [ 3951.173227] sd 1324:0:0:0: [sde] CDB: Read(10) 28 00 00 00 00 80 00 00 f0 00
Jun 8 12:67:09 ubuntu kernel: [ 3951.173230] blk_update_request: I/O error, dev sde, sector 128
Jun 8 12:67:09 ubuntu kernel: [ 3951.173254] sd 1324:0:0:0: [sde] FAILED Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Jun 8 12:67:09 ubuntu kernel: [ 3951.173257] sd 1324:0:0:0: [sde] CDB: Read(10) 28 00 00 00 01 70 00 00 90 00
Jun 8 12:67:09 ubuntu kernel: [ 3951.173259] blk_update_request: I/O error, dev sde, sector 368
Jun 8 12:67:09 ubuntu kernel: [ 3951.173301] sd 1324:0:0:0: [sde] Synchronize Cache(10) failed: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
Jun 8 12:67:09 ubuntu kernel: [ 3951.174272] Buffer I/O error on dev sde, logical block 16, async page read
Jun 8 12:67:09 ubuntu kernel: [ 3951.174310] Buffer I/O error on dev sde, logical block 2, async page read
Jun 8 12:67:09 ubuntu systemd-udevd[27313]: inotify_add_watch(9, /dev/sde, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27328]: inotify_add_watch(9, /dev/sde3, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27313]: inotify_add_watch(9, /dev/sde1, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27328]: inotify_add_watch(9, /dev/sde18, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27329]: inotify_add_watch(9, /dev/sde4, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27326]: inotify_add_watch(9, /dev/sde17, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27313]: inotify_add_watch(9, /dev/sde19, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27326]: inotify_add_watch(9, /dev/sde23, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27328]: inotify_add_watch(9, /dev/sde20, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27327]: inotify_add_watch(9, /dev/sde22, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27329]: inotify_add_watch(9, /dev/sde21, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27338]: inotify_add_watch(9, /dev/sde29, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27329]: inotify_add_watch(9, /dev/sde27, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27327]: inotify_add_watch(9, /dev/sde28, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27313]: inotify_add_watch(9, /dev/sde24, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27329]: inotify_add_watch(9, /dev/sde30, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27309]: inotify_add_watch(9, /dev/sde34, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27309]: inotify_add_watch(9, /dev/sde35, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27309]: inotify_add_watch(9, /dev/sde36, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27327]: inotify_add_watch(9, /dev/sde31, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27329]: inotify_add_watch(9, /dev/sde33, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27338]: inotify_add_watch(9, /dev/sde32, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27326]: inotify_add_watch(9, /dev/sde25, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27328]: inotify_add_watch(9, /dev/sde26, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27339]: inotify_add_watch(9, /dev/sde9, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27342]: inotify_add_watch(9, /dev/sde12, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27340]: inotify_add_watch(9, /dev/sde10, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27337]: inotify_add_watch(9, /dev/sde7, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27343]: inotify_add_watch(9, /dev/sde13, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27341]: inotify_add_watch(9, /dev/sde11, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27344]: inotify_add_watch(9, /dev/sde14, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27346]: inotify_add_watch(9, /dev/sde16, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu systemd-udevd[27345]: inotify_add_watch(9, /dev/sde15, 10) failed: No such file or directory
Jun 8 12:67:10 ubuntu kernel: [ 3952.056384] usb 2-1.2: new high-speed USB device number 102 using ehci-pci
Jun 8 12:67:10 ubuntu kernel: [ 3952.149081] usb 2-1.2: config 1 has an invalid interface number: 20 but max is 1
Jun 8 12:67:10 ubuntu kernel: [ 3952.149090] usb 2-1.2: config 1 has no interface number 1