Rescue and Recovery change product key

[zenek]

Hi

I have two lenovo n100, i loose whole data on one of them and now want back my rescue partition.
I have copied it from second computer but now they use same product key.

On rescue partition in RECOVERY folder there are many IMZ files and IMD.
IMD contain image of partition (indeed it is PQI file) i have extracted it, change product key in I386\UNATTEND.TXT file and made new image. It didn't work (R&R works fine, but key didn't changed after installation),
Then i found next image file IMD iin RECOVERY\IUSDK\ folder
I have also changed UNATTEND.TXT file in this image and fix checksums in CRI files (CRC16 CCITT)
Still nothing
anyway during the installation, there is UNATTEND.TXT in C:\I386\
if you check it in begining of installation it does not include product key! but in the end it does! and still it is original key

any ideas ?