Software suites, such as the Nokia Software Recovery Tool are nowadays redundant at best.
Android offers a full recovery mode, accessible from the phone's hidden startup menu.
Please see the following link for detailed instructions:
This should apply for Nokia 3, 6 and 8 also, as the button commands are very common for Android phones.
Rather than a full suit, we, first of all, need downloadable ROMs. So that the customers can flash their phones (via Recovery) themselves rather than visiting a service point.
Sony have Xperia Companion, which helps really if your phone stuck at bootloop or you have some serious problems.
Through Xperia Companion there is ´Software Repair´ option which helps about the problems I mentioned above.
So, Nokia needs to bring back NSRT
Nokia recovery tools were very useful to troubleshoot Nokia phones :)