I might have done something wrong. So please don't avoid trying it because of what happened to me. But do have a backup of your eMMC just in case.
FWIW, I used `dd` on a computer with NetBSD to create the working SD card. You could use `dd` in Manjaro on your PBP. I don't know the first thing about Etcher. I've heard lots of good things about it, and never heard anything bad about it. But `dd` is the most direct way to do this job. I can't imagine using anything else (in Unix/Linux).
dd if=file.img of=/dev/sd bs=4M status=progress
Should get the job done in Manjaro, I think. Of course, replace "file.img" with the correct image file. If it's zipped, unzip it first. (unzip file.img.bzip) You'll have to replace /dev/sd with the raw device for the SD card. I don't recall the device name for Manjaro; you might already know it. If you don't, let me know and I'll dig up that information.
FWIW, I used `dd` on a computer with NetBSD to create the working SD card. You could use `dd` in Manjaro on your PBP. I don't know the first thing about Etcher. I've heard lots of good things about it, and never heard anything bad about it. But `dd` is the most direct way to do this job. I can't imagine using anything else (in Unix/Linux).
dd if=file.img of=/dev/sd bs=4M status=progress
Should get the job done in Manjaro, I think. Of course, replace "file.img" with the correct image file. If it's zipped, unzip it first. (unzip file.img.bzip) You'll have to replace /dev/sd with the raw device for the SD card. I don't recall the device name for Manjaro; you might already know it. If you don't, let me know and I'll dig up that information.