Seems that everyone is starting a DR business...

. Anyway, regardless of the solutions you buy (market available) , the difference is made by YOU. Firmware related problems are - in my experience - 20% of the total issues, keep in mind that most of the problems are electrical/mechanical including heads and so on, and then it's only a matter of study, time and practice.
I had to work it out all by myself because of many factors, and later I had to develop my own proprietary solutions especially for Samsung, Toshiba and other (diagnose/gain access/some repair) before I quit DR.
The main reason I quit DR is that too many people, with legit or not solutions are starting so-called DR business(es), producing only a terrible mess and making damage on the drives beyond repair poking with things they don't master or know. I have many alternative fields to work on, where I have no competition, so why worry ?
@datarec
This community is NOT for share with each other, even if most people won't tell it (it's implicit) because the pros do business for a living. A little help (if known solution, I pointed out that the majority rely on the market available solutions, highly skilled pros are very few and have about zero time for staying here) is one thing, destroy business and spoil the market is another.
Just ask your mechanic if he can make a copy of car service manuals or tell you how ECM work... or your doctor to give you training in surgery (it's so easy, even him has been trained !).
If I were you, I'll ask politely if someone in YOUR area can give you training and what will it cost, then if you can afford it you can hire that service.
There's nothing to be ashamed in starting a new business and asking for skilled people to get trained, but not for free. Business is business and child play is child play.
For example, I can give you all the training you need, I don't care what solution(s) you have , but you have to pay me. I'll give regular invoice and pay dues and taxes on it. After that you can judge if I have done a good or bad job, NOT BEFORE. Training and education is another business. (It's not self promotion

)
If you find some good soul can give you all the training you need for free, good for you - but maybe this is not the right place, I think.
(I think I have wasted my time with this post but I felt the urge to speak)
Regards.