4LO blinking and ABS remained lit continuously

Hello gentlemen,
This is my first post on this site that I just discovered.
Here, I have a Toyota 4WD hILUX, code model: GUN125L-DTFMH, manual transmission, Engine: 2GDFTV.
Recently, I had a totally unexpected problem just wanting to try the 4LO. I did not even move from my parking spot that I noticed on the dashboard, the orange indicator on the 4LO flashing at the same time that the ABS that remained lit continuously. I insisted to unlock and return to the switch H2-L4H-4LO but nothing to do, the transfer box was stuck on the 4LO. What I did, I deactivated the 4LO manually by intervening directly on actuator assy transfer shift to put the transmission in H2. Following this, I changed the actuator assy shift transfer by another brand new one. I thought naturally that the failure came from this organ but it is not! The problem has always remained as it is. And now I have the following error codes:
C1268
U0114
U0122
P17AC
What to do? Could someone guide me please?
I thank you in advance.
PS: sorry for my average English because I speak French. :)