Default [Q] Can I repair IMEI of s5830L without any box?

Hello, I have a galaxy ace s5830L but it's locked (it says emergency calls only). Can I repair it without any box? (I can't afford one). I've read quite a few tutorials but nothing has worked for me, and z3x shell requires a box, so that's off the table.

I tried this:
but apparently it's not meant to do what I wanna do 'cause it didn't work

I also tried this:
but my phone doesn't ask for any unlock code and none of those methods worked for me (it's not locked for a company, but entirely locked)

And I wanted to try this, but I realized that I needed a box (didn't know that was a piece of hardware lol)

Help please!