What is the maximum speed in a 2-pair cable?

Question

Cables and wires

There is a cable , as I understand it, there are two pairs.
The problem is that the cable is already in the wall, and when I bought it, I did not look at it, and the description at that time was incomplete. I was sure that there were exactly 4 pairs.
The question is, what maximum speed can I develop with it? 10 mb?
This is not enough. What to do now, to score and not crimp at all into sockets?
Is it possible to somehow strengthen this all or just replace the cable?
Something I'm upset about, the finish is already fine and complete, and the cable is immured in the wall.

Answer 1

cat 5e cannot be two pairs

Answer 2

I'll tell you a secret: even in an 8-core cable, data goes through 1,2,3 and 6 cores.
An 8-core cable can also be powered: POE - Power Over Ethernet.
Using an 8-core cable, you can even connect to 2 points - I have IP-TV and LAN connected over the 1st cable. The connection speed with the provider's resources is more than 100Mbps.
Don't worry, everything is fine!

Answer 3

100 megabits full duplex (in both directions, that is).