ECU replacement aftermath?

I recently replaced my faulty ECU; the car worked and has been driven around for over 3 days without any fault.
But after replacement, and except for the battery light, ABS, other lights such as oil, engine, transmission (PNRDL) have never come on. The central lock with remote from the outside too did not function.

Although prior to this replacement, ECU from a friends Lexus was installed to be sure it's an ECU fault, and it worked perfectly, with all light and function working.

What do you think the issue is please?

VIN JTEGF21A020053229