Please help 4wd actuator?

I've been having an issue getting my 2007 taco into 4wd. It was getting harder and harder to get in and now it doesn't go at all. I tried soldering all the connections on diff actuator and still nothing. If I'm in 2wd and go to 4wd the t case locks in 4wd and so does front drive shaft. No front diff. Amd then I need to take t case actuator off because it will stick in 4wd and not go back to 2 any ideas? And please dont tell me to do figure 8 and go on uneven terrain ive tried every combo reverse drive left right 8s everything...

 

Start with the links below.
To fix this, you really need to know what is happening, and how the system work.
Seriously, read the documents attached in those links.
I bet if you follow the steps, you’ll figure it out.
Good luck to you. Let us know if you figure it out.

https://www.tacomaworld.com/threads/how-to-trouble-shoot-4x4-actuator.263525/page-7#post-8538436

https://www.tacomaworld.com/threads/4x4-problem-i-cant-resolve.575092/#post-19056025