Ignition switch Skoda Felicia 1.3 98 - replacement - immobilizer

Hello.
I have a problem with the ignition;
Symptoms (0-1-2-3):
- in the direction of 0 to 2 everything looks normal
-starting at 3 sometimes starts sometimes at all (lights unchanged)
- if you start the engine and release the key to 2, you can still hear the starter
no load, brake light on
- gentle "return" with the key and the starter turned off, the brake is on
- returning "almost under item 2 the brake lamp turns off.
And we can go.
Has anyone ever had such "eggs"?
I know the key switch to replace.
After defeating the screws and "broken heads" (still ahead of me) waiting for me
electronic problem - immobilizer.
I read on the forums that there will be a problem with the computer.
Truth?
How to get rid of the problem in "home conditions"?
Replacing a complete ignition with keys is not enough?
Regards.

MonikaMarcin wrote:

I know the key switch to replace.

You have to replace the ignition cube.

moto-kord wrote:

You have to replace the ignition cube.

I am buying an ignition cube with an immobilizer. I mention.
Fires? Anything else to do? Comp?

MonikaMarcin wrote:

I buy the ignition cube

The "ignition block" as well as the "ignition box" is something completely separate from the "immobilizer".

So replacing the cube and putting the transponder in the keys after the problem?

Added after 7 [minutes]:

https://www.google.pl/url?sa=i&rct=j&q=&esrc=...%2F%2Fwww.kupsito.sk%2Fi%2F6565399975%2FZAPA% 25C4% 25BDOVANIE_COMPLETE_ 25A0KODA_FELICIA_Felicja_98_SLOVENSK% 25C5% 2581% 25C3% = & psig AOvVaw2N7dWrnc Nx94RCSysqVdf &-paragraph = 1509784561104104

Added after 37 [seconds]:

is it such a miracle?

You replace the ignition block itself. DO NOT move the transponder, coil, key.

Added after 5 [minutes]:

Thanks.
Now I know what it looks like "from the inside".
Exchanged and plays like this doll