"No bootable device" after manual partitioning Manjaro 18.1.3

First off, I admit I am very very new to Manjaro, so I'm afraid any advice will have to be very simple for me to understand.

I have recently been trying to install the latest version of Manjaro on my new laptop, the Acer Aspire E15 -(I can give the exact model if needed). I intend to also dual-boot Windows 10 (as much as I dislike Windows) to run a couple of needed programs. However, that's another topic, and the task I am trying to accomplish is simply manually partitioning Manjaro.

My setup is this: a 256GB nvme SSD, and a 1TB HDD. I wanted to install my system, root, programs, or whatever on the SSD, leaving enough room for Windows later, then mount the HDD as my /home Manjaro folder for storing data. I assume the only way to do that is to manually partition.
However, every single way I have tried to do this has utterly failed, ending up with the dead-end "No bootable device" message from my Acer.

This is what I tried: first, a 512 MiB FAT32 partition with the mount point of /boot/efi and bootflags 'boot' & 'esp', then a 70GB ext4 partition mounted at /, then some swap -- all of which on the SSD. Then I formatted the HDD as ext4 and gave it the mount point of /home. Nothing wrong, right??

However, finishing the installation and rebooting gets me the "no bootable device" thing again. Basically, I have exactly followed this tutorial and it hasn't seemed to work.

Is there something obvious I am missing here?? I know it has to be something with some sort of boot file missing or something, but I'm really clueless, since I have almost zero knowledge in this area.

Any advice on how to fix this, or a proper (better than what I've done) way to manually partition would be HUGELY appreciated.

Some Acer models are difficult to set up uefi boot entries. Take a look at these 2 links. Maybe these can help. If you have a different method to fix, document it here so others can refer to it as well.
Link 1
Link 2

You may want to take a look at this common tread.
Common reference link


Just to confirm, my problem was indeed the Acer Aspire firmware (or whatever you call it) that didn't recognize the Manjaro boot file as legitimate until I added it as a "trusted" file, as shown in the first link in the reply above.

Thanks again so much for the help!

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