Devo F12E Incorrect Screen Resolution

that is definitely not normal. Maybe they changed their chipset on newer versions or possibbly a bug has snuck in (I haven't tried the F12E for quite some time) What version of the stock Walkera firmware are you using? I can't look into it right now, but I'll check that (a) it still works for me, and (b) they haven't changed the hardware. That would help me locate the issue.

Can you try this build:
www.deviationtx.com/downloads-new/catego...lue-f12e-alt-display

Note that the installation procedure has changed. If you are using the DeviationUploader switch to the 'DFU' tab, and upload just the .dfu file.
Then reboot the Tx into USB mode (it will probably do this automatically the 1st time) and copy the devo.fs file included in the zip to the transmitter (overwrite the existing devo.fs file)

Do not use try to use DeviationUploader to install the .zip file directly.

It seems hardware related. I have a v1.3a transmitter, and the old code works fine for me there.

In the F12e drivers I wrote last year, I have 2 sets of LCD initialization code 'code1' and 'code2'. Curently we are using 'code2' in the release builds. The test code I provided to you is 'code1' (which also seems to work fine on my Tx). I think 'Code1' is the same as what is in the Walkera 1.5 firmware. I have no idea where 'code2' came from (I did write this code over a year ago). The thing is, I also don't know why I have 2 sets of code in the 1st place, so I need to go back through the code history and try to figure out if there is a reason for 'code2' to exist before I make the change permanent. If worse comes to worse, I could potentially offer both codes and let you choose as a configuration option, but I really don't want to go there.

This is likely to take a lot of trial and error to fix since I can't duplicate the problem myself.
Can you try this firmware:
www.deviationtx.com/downloads-new/catego...turedblue-f12e-test1

It won't fix the problem, but it should display a debug screen. Take a picture of that screen and send it to me.
You can press the 'EXT' button to continue booting after you've captured the screen

What about this one:
www.deviationtx.com/downloads-new/catego...turedblue-f12e-test2

Hmm...that wasn't what I hoped for. I need to do some more reading to see what I can come up with

Okay, change of direction.
Try this:
www.deviationtx.com/downloads-new/catego...dump-bootloader-f12e

It does not contain a devo.fs file. Upload it to your Tx, You should see 'Done' and then your Tx should connect to your PC via USB (you won't get the 'USB' message, just 'Done')

Now, copy the devo.fs from your transmitter, zip it up and attach it to a message here. I am hopeful it will help me identify the difference between your Tx and mine.

Note that this isn't a real firmware. You can't use it for anything other than creating the devo.fs file I need.

That was helpful I think. Let's try this:
www.deviationtx.com/downloads-new/catego...turedblue-f12e-test3

hmm. does the programming screen look normal (When you boot pressing 'EXT')? I am trying to emulate how that works.

Back to the basics. Try test 4:
www.deviationtx.com/downloads-new/catego...turedblue-f12e-test4

This should show the alphabet in big letters.