Hello timonych,
Yes, it was stopping at 55%.
I didn't had time to post here, but meanwhile i finally found a solution to install DSM7 on my ESXI 6.7 Hp Microserver Gen 8!
I used tinycore-redpill.v0.9.3.0 and the .pat version was DSM_DS3622xs+_42218. Everything went fine!
I have all the steps of the installation, but as they are in portuguese, i need to translate to english... unfortunately i didn't had much time those days
But if you have any doubt, don't hesitate to ask and i try to answer (if i have the knowledge!)