BQ Aquaris X5 paella doesn't boot

Describe your issue

What's the expected behaviour?

I was trying to flash pmOS on my BQ Aquaris X5. The instructions in the wiki only mentions BQ and Cyanogem bootloaders, but my device had already been flashed with LineageOS. I asked @lazzardo for advice and then went ahead flashing lk2nd and followed the installation guide, using pmbootstrap.

What's the current behaviour?

After booting the kernel with pmbootstrap flasher boot I get a blank screen (after some initial flickering). I'm also able to ping the IP, but not to ssh into the device ssh: connect to host 172.16.42.1 port 22: Connection refused.

How to reproduce your issue?

Just follow the installation instructions on a device that had LineageOS installed.

What device are you using?

bq-paella

On what postmarketOS version did you encounter the issue?

• edge (master branch)
• stable (v20.05 branch)

On what environment did you encounter the issue?

Phone environments

• Phosh
• Plasma Mobile
• Sxmo

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

Additional information

First of all, I've used pmbootstrap install --fde to create the image

Then, I had a two issues that I had to work around, and which may be the cause of my failure.

First, I had to use fastboot flash:raw boot lk2nd.img (note the :raw) to install lk2nd. Without that I would get fastboot: error: Couldn't parse partition size '0x'

The second issue I had was when flashing the rootfs:

$ pmbootstrap flasher flash_rootfs                   
[14:52:03] (native) flash rootfs image
Sending sparse 'system' 1/6 (253837 KB)            OKAY [  7.970s]
Writing 'system'                                   FAILED (remote: 'size too large')
fastboot: error: Command failed                                                        
[14:52:12] NOTE: The failed command's output is above the ^^^ line in the log file: /bkup/pmOS/pmbootstrap/log.txt
[14:52:12] ERROR: Command failed: (native) % fastboot flash system /home/pmos/rootfs/bq-paella.img
[14:52:12] See also: <https://postmarketos.org/troubleshooting>

As suggested in the wiki, I've used pmbootstrap flasher flash_rootfs --partition userdata instead.

Any of the above issues may be causing the problem in my installation. Any help/suggestions are welcome.