There is no essential difference between 3DS cracking A9 and B9.

A9 gains the control of 3DS by modifying the boot priority, while B9 directly signs CFW on the system chip and writes it, so that the system can regard it as a legal program and gain more comprehensive control.

Generally speaking, the technical content of B9 is more complicated. Let's make a simple analogy: A9 is equivalent to renting a house, and B9 is equivalent to buying a house. There is no obvious difference between the functions of B9 and A9 at present, and there is not much influence. Just as renting a house is just for a place to stay, the promotion of B9 is not urgent.

Conversely, for programmers who specialize in writing 3DS CFW (such as Luma3DS) or homebrew, getting more system permissions means that they can add more functions more conveniently when writing programs. For example, it is no longer necessary to install NDS into SD through NDS burning card.

Extended data:

No matter whether a9 or b9 is used, 3DS cracking may be prohibited. The main reasons are as follows:

According to the domestic 3ds cracking center's test of a player's Basketball Flying Man VIII, it is found that FreeShop, a self-made software that can download eshop content for free, is probably the main reason for this title.

Because two machines using freeshop were banned after networking; China's China version of the system will be banned after it is connected with eShop. However, if only a single system is cracked, it will not be banned after networking.

Prior to this, Nintendo's Pokemon: Day/Month had already encountered the situation of pirated software "stealing" during the sale process, and Nintendo also banned players who used this pirated game on a large scale in advance.

The latest crack of "B9" Boot 9 Strap in 3DS, which just appeared recently, is probably the reason why Nintendo is determined to crack players.

This cracking system is called "the last step to break through 3ds". Its working principle is to sign the firmware with the obtained key, and any signed firmware will be recognized as valid by 3DS. Nintendo can only avoid this cracking by replacing the hardware chip of 3DS itself, and no system upgrade can eliminate the disguised digital signature of this software.

References:

Baidu Library Nintendo 3DS