Is this the last way to keep my IMEI in my phone? I've no experience in QPST at all so I hope I won't brick my new phone.
I believe, that your remaining options are all QPST based.
First of all you must do a backup of your actual NVram, likely is damaged but better than nothing, and is a good way to check the QPST functionality, if you have the needed drivers nad so on.
So the first option is to check if oneclick updater did the nvram update you should have a Save0.nvm file on the main one click updater directory, if you have it you can just try to restore it with QPST.
Then you can follow the instructions posted earlier to set the imei directly in the phone
Another option is to look at your nvram backup, and hex edit it to restore the IMEI
As last resort you can use the NVram from fully a working phone editing the imei and the mac adresses to match your ones.
As usual the bigger is the problem, the longer/harder is the way to fix it.
But hardly you will get a bricked phone. QPST is used mainly to resurrect already dead phones, so...
It's too bad that Italy lost in the last thirty minutes the important defense man Motta so Italy had to play with ten man and Spain could continue the offense game play (at the end 4:0). But I congratulate both teams, Spain and Italy for their great and especially fair match.
We already did it in 1970: great semifinal with Germany, poor final with Brazil.
This time we were unlucky too, but Spain deserved the victory anyway, we were to tired.