You may want to wipe the broken install and try again. Since you successfully upgraded and it failed after that you wipe, do a fresh install and then the usual drivers and restore your files and apps. Just like we do when Windows gets blown.
Unlike prior Windows, 10 updates then is good to go without a CDKEY like days of old.
Your post is light on detail. For example a friend had a 32GB SSD. That hung later and we had to do over.
After updating from w7 to w10 (on AMD4core 64), both fresh on ssd, windows stops soon after bios - w10 shows some circle-dots and then these are freezing. After pushing the reset button the startprocess follows correctly, and i can work. Why this extra step, and how to solve this?