MB W204 W212 EIS replace

[babeh]

I have successfully replaced dead EIS in 08'W212 with 12' donor EIS, keep using same original MB keys and programmed new key without problems.

My question is, the donor EIS come with key(single battery, not NEC can't reprogram), is it possible I can use that donor key ?
What if renew and program EIS only use donor SSID and key password, but keep using original car sonder and key slots hash,
I know also need to renew ESL and the car original keys will become useless.
is it possible make the donor key works in another car ?

If it is working this way, then no need to re-learn drive authorization.

[MVVL]

In addition to the EIS, there are also key hashes in the automatic transmission and in the ECU, ISM, ESL - depending on the car. In order to use the key and the EIS from the donor, it was necessary to reset these computers. Is it worth it for one key?

[babeh]

In addition to the EIS, there are also key hashes in the automatic transmission and in the ECU, ISM, ESL - depending on the car. In order to use the key and the EIS from the donor, it was necessary to reset these computers. Is it worth it for one key?

Tks for the advise.
I'm just curious is it possible to use donor key without renew ECU TCU etc.
Keep using car's original hash, not the hashes from donor EIS.
if re-learn the whole DAS is the only way of course it is not worth.

If ECU TCU etc not care about SSID and key password, looks like it is possbile.!?

[MVVL]

The donor key has its own hash, which does not correspond to the hashes available in the original ЕIS, TSU, ESL ....... How will it work?

[babeh]

The donor key has its own hash, which does not correspond to the hashes available in the original ЕIS, TSU, ESL ....... How will it work?

I see, tks for info.