This keyboard is a Keytronic E03602
At the back it has a hole with a missing switch for
Xt / enchanced xt/at mode.

I tried 3 times in a row and at boot, it show keyboard error but work and wrote garbage character, probably because it was in at mode.

But the time third i tried it, i push a lot of keys at ramdom for 30 seconds just for fun, and after that like a miracle, everything work correctly like a xt 83 key keyboard. Even sysinfo detect a 83 keys keyboard.
I play with it for 1 hour. Every keys works great.
But after 1 hour i turn off the computer. I turn it on again but i cant get it to work in xt 83 key keyboard mode. I just tried for 45 minutes. Push keys at ramdom dont work anymore LoL!

Does this keyboard has a combo key to switch between xt and at ? Why did it work ? What i did to get this keyboard working in xt mode.

I want to use this keyboard in xt mode. But the keyboard has no switch. Check my pictures. Thanks a lot for help and answer.