Unable to program Certification ECU

I'm at a total lost here. I own a 2010 Prius. Never had any issue with it. I recently lost all proximity function, I can't unlock from exterior handle, can not start with the push-button but I can start by placing key next to barrel. I have replaced the battery in the remote but still same issue.

I own a techstream (china...) so I tried to reprogram my key, when I place key next to button, car beeps once, then I remove the key and place on passenger seat but the car never beep a second time.

I assumed this was related to an issue with the Certification ECU as all antennas are entering this module. I checked all power and ground to the module and everything is normal.

I ordered a used Certification ECU, went to try the Smart Code Reset, enter passcode, and then after 16 minutes the reset procedure failed. I tried multiple times with the same result.

I then tried the Smart Code Reset on my factory module and it worked ! So I know my techstream works fine, but now my key was also reset from my factory module and if I try to reprogram I am back to problem where the car does not beep a second time.

I even ordered a second Certification ECU and again same problem I can not reset the Smart Code !!!!

I am totally lost here and have absolutly no idea what to do next. Can anyone confirm that I can actually reset a used Certification ECU ?

 

Cr16 something, I carefully took the same type that was in before.
It was at 2.1, I tried replacing it with same result
12.3v
No all buttons click no problem there
Not at the moment the trouble started

Thank you for your help

 

I definitly have to say I regret that I got in such a mess but now really idea how to make the car start again.