[Galaxy A3, A5, A7, A8, A9 Original Android Develop] uplink-svk:
So, here's how I managed with my friend, it was quiet a birth, but hell, it works, very good to my surprise:

- in general follow these steps, they're mix of ones from android.gs and mine, to flash TWRP & install CM from mygalaxya:

Download and install this driver for Samsung USB. Restart Your computer!

On your computer download Odin then unzip the file and follow on screen prompts for installing the software.

Remember to install the Galaxy A3 USB drivers.

Finally, download the TWRP recovery file from here place the package on desktop and unzip it. Yes, first download the old version, TWRP 2.8.7.0, otherwise it won't work.

Power off your device; wait a few moments and then reboot your phone in download mode. Do this by holding down all at once: power button + home button + volume down.

Run Odin on your computer and then connect your smartphone with the PC via USB cable.

Odin will have to recognize your phone – if everything works as planned, on the program the “added” message will be displayed and the ID:COM field will be turned yellow or blue.

If that isn’t happening, close the program, unplug the USB cable and reinstall USB drivers before trying to reapply the steps from above.

Now, from the program click on the “AP” option; then load the TWRP recovery file from desktop. The .tar file, not the img file!

Uncheck check the Re Partition and Auto Reboot

fields from Odin; and click on “start” when you are ready.

Now, TWRP recovery will be automatically installed on your Samsung Galaxy A3.

If during the flashing process Odin gets stuck, close the tool, remove the USB connection, force restart your phone and retry the steps from above.

The process will be completed when the “pass” message will be displayed and when the ID:COM field will be turned green.

You can then remove the USB cord and reboot your A3 – if during the last reboot your phone gets stuck in a boot loop follow: access recovery mode and from there make a hard reset and clear cache (basically, choose “wipe data factory reset” and “wipe cache partition”); when done, from main menu of recovery pick “reboot system now”.

Go to the normal OS mode, copy TWRP 3.0.0.0 from mygalaxya [can be found in some thread] and copy it to the root of Your phone. Copy the .img file! Also copy the mygalaxya's CM, don't unzip it! Whole archive as You downloaded it.

shut down Your phone, don't restart!

use power + volume up + home button ape move to turn on Your phone, hold it till You'll see two lines of some blabber, red and yellow + wait for TWRP.

inside TWRP first flash TWRP to TWRP 3.0.0.0 via old TWRP. Switch to IMAGE, in lower right corner, in Flash option, so You can find it within root.

IMPORTANT STEP!!!: Create a full backup of Your old system from Samsung, getting it from internet is pain in the ass. Create a backup to Your memory card, or internal memory. Recovery works just fine. Tested 3 times!

wipe cache, dalvik/art, system,

don't

wipe internal memory, never, ever!, and ignore the other [otg/memory card, etc.]

IMPORTANT STEP!!!: DON'T RESTART TWRP !!!, or You're screwed!

flash CM 13 from mygalaxya

wipe dalvik/cache [optional]

turn off Your device via TWRP, don't restart!

turn on Your device with power button

In order to get to TWRP, use ape move, power + home + volume up, if it gets ****ed up, use power + home + volume down, even when Your're stuck, and reflash the old TWRP via Odin. There You'll have to hold, really long, and press volume up for continue, when warrning comes on the screen, and than You can use Odin in download mode. Never ever disconnect Your phone when You transfer data in transfer mode!

Hope this helps!

Cheers!

Bryan

//edit: some bug reports:

front camera isn't working, only back facing, when I switch them, they're always front, and panorama is going upside down

when I press back on browser, I get this graphical bug, whole screen goes haywire for a while

dual sim doesn't work

I'll update when I find another bugs