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So I was going to root this (previsouly healthy) BQ A4.5. Unlocked the bootloader and flashed TWRP from here:

$ fastboot oem unlock
(bootloader) Start unlock flow

OKAY [ 32.954s]
Finished. Total time: 32.960s
$ fastboot flash recovery downloads/twrp-3.3.1-0-dendeone.img
target reported max download size of 134217728 bytes
Sending 'recovery' (11342 KB)...
OKAY [  0.378s]
Writing 'recovery'...
OKAY [  0.335s]
Finished. Total time: 0.727s
$ fastboot reboot bootloader
rebooting into bootloader
OKAY [  0.003s]
Finished. Total time: 0.058s
$ fastboot reboot
Rebooting...

Finished. Total time: 0.058s

The first reboot to bootloader didn't do anything. Now it's on a bootloop which states:

Orange State
Your device has been unlocked and can't be trusted
Your device will boot in 5 seconds

Pressing Volume Up + PowerOn used to work for recovery (that's how I got into fastboot mode). Now, pressing Volume Up/Down/Up+Down + PowerOn doesn't do anything, fastboot stands indefinitely < waiting for any device >, and adb always responds with error: no devices/emulators found regardless of when it's run. If I press Volume Up+Down it turns off. Plugging in USB it turns on. Nothing else seems to respond.

dmesg states:

[32774.364937] usb 2-7: new high-speed USB device number 59 using xhci_hcd
[32774.514434] cdc_acm 2-7:1.0: Zero length descriptor references
[32774.514450] cdc_acm: probe of 2-7:1.0 failed with error -22
[32774.554519] cdc_acm 2-7:1.1: ttyACM0: USB ACM device
[32777.142205] usb 2-7: USB disconnect, device number 59

The disconnect happens before the bq logo appears.

Trash bin time?

  • Orange state is just a warning shown by bootloader on unlocked devices which implement Android Verified Boot. All that you need to do is find the proper key combination to boot into bootloader mode, which is definitely running. – Irfan Latif Sep 14 at 18:47

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