CTC A13 help?

[Fodiac7]

Good Afternoon everyone,

im hoping for some help on my 3d printer. Im new to the scene and bought a cheap clone called the CTC A13 (Ender 3 v2 not Prusia i3) from ebay to see if "it's for me".......which i have found i do love.
my question is a few part one so im sorry for the long post.
1. what board does my printer have (on the chip is states Atmega 1284p)i read this is 8bit?
2. how do i check what firmware my board is using, Marlin, Sailfish etc.
3. would it be beneficial to upgrade my board to 32 bit? if so which board, creality 4.2.7 or the big tree tech mini or 1.4?

any help on any of the above would be great.

P.S my printer is solidly built, i must be one of the lucky ones!!

update: i believe my board is the Anet v1.5.